If you are open to Africa you should consider Morocco. It will be a bit chilly in December, but still warm enough to enjoy everything. The culture there is fascinating and it’s also very tourist-friendly and safe. I think it would be cheaper for you to fly to Morocco than to the Americas, and the daily costs are very reasonable as well. Those should give you some things to think about, and feel free to follow up if you have other questions.

Malta would have decent weather as well, but I think the nightlife there is pretty dead during the colder months because they don’t get many visitors. They don’t have proper beaches as well, as the coastline is mostly these huge rocks. If you really want a warm beach in December your best bet is the Canary Islands, and even then it can be slightly chilly in December. But the nightlife in Malta is pretty dull, since so many of the visitors are retired Europeans.
The 17th-annual Hilton Head Island Motoring Festival and Concourse d’Elegance takes place Oct. 26-Nov. 4, attracting automobile enthusiasts and all who enjoy the southern charm, splendid fall weather, and extraordinary classic cars. The Hilton Head Island Oyster Festival (Nov. 9-10) is an oyster extravaganza with live music, crafts, a Kid Zone, and sports lounge. A stay at the Inn and Club at Harbour Town at the Sea Pines Resort will provide luxury and comfort in low country style. Or book a home rental through Vacation Company. 
November brings the annual Vodafone Mexefest Music Festival (Nov. 24-25), a gathering of popular artists in venues throughout Lisbon. The Lisbon & Sintra Film Festival, in its 12th year, is a celebration of cinema with directors, actors, artists, musicians, and writers in town for the event (Nov. 16-25). Billed as the “largest technology conference in the world,” Web Summit began in 2010 as a way to connect industry and the technology community (Nov. 5-8). The year’s new wine and the ripening of chestnuts are celebrated with the Magusto, on Nov. 11, St. Martin’s Day. The holiday spirit becomes apparent at the end of the month, with colorful lights and roasted chestnut vendors along the streets.
By the time November rolls around, Cancun has pretty much perfect weather for anyone. The heat of summer and early autumn has turned into a tropical warmth that is usually accompanied by pleasant breezes so it's lovely all day and all evening. The peak season doesn't start until late December so this is the perfect time to visit when rates are still nearly at their summer lows.
While Cancun has become the king of the Mexican beach resort towns in the few decades since it was formed, it's only one of many, and all of them on both coasts have very nice weather in December. In fact, Cancun is probably the most expensive of them, so especially if you are coming from the west coast you are better off in Puerto Vallarta, Acapulco, or Los Cabos instead.
We flew with EasyJet and I was pleasantly surprised at the availability of keto food on the flight. I got a tapas box which had jamon serrano, chorizo and a tomato salsa that was, amazingly, sugar free! It was plenty to keep me going until we had dinner at the villa that evening. I didn’t track my carbs on this trip because I was eating keto the whole time so even when I went over slightly I wasn’t massively over. I also spent a lot of time swimming in the Mediterranean Sea and it was so hot I think I must have lost 5lbs in sweat alone! Sorry.
As for key events in December, I typically avoid those sorts of things myself, so I’m not a good source on that. I actually visited Rio de Janeiro during Carnival, by accident, and it drives hotel prices so high and also crowds that it’s probably the worst time to visit unless you specifically want to spend all night watching the parades. And Oktoberfest, as another example, literally triples the prices of hotel rooms in Munich, so it’s only worth it if you REALLY want to get involved in the Oktoberfest thing yourself. But plenty of other travelers love to go witness the biggest events, and I assume they love it, so there is no right or wrong.

It can still be rainy in Belize in November, so it’s not an ideal time to visit. I quite like Belize and there is a lot to do there, including of course the second largest coral reef in the world. You can also head over the Guatemala border to visit Tikal and even down to Antigua for something different. You don’t get many great beaches there, but aside from that it is great.


I think Spain is probably your best bet, and you can probably get there on a reasonably priced flight with a change in Dubai or Abu Dhabi. The winter weather is decent and the big cities are always packed with locals rather than so many tourists. Barcelona is probably more fun than Madrid, though both are big cities with a lot to see and notoriously good nightlife. If you get a cheap enough flight I don’t think you need to do a package. It’s pretty easy to get around Spain’s big cities just on English, as long as you do a bit of research. In 5 days you could spend 3 days in Barcelona and then 2 days in Madrid, or just 5 days in the Barcelona area. It’s a big city with plenty to see and some good day trips. You could also go to Valencia, which is also really fun and a short train ride away.


On Monday morning we arrived at our hotel, dropped our stuff in the room, and headed out to our first stop. We had a light breakfast at home, and mine consisted of a fatty coffee and 2 pieces of bacon. So we were all pretty hungry by around 1 pm. We headed to one of the food joints nearby, and I found a southwest grilled chicken salad (Meal 1) on their menu. After asking them to hold the black bean relish and sugary dressing, I ended up with a decent sized bowl of salad mix topped with half a grilled chicken breast and a good-sized scoop of chopped avocado. I topped it off with salt, pepper, and a packet of blue cheese dressing.
As for alternatives you might consider Argentina, where of course it will be late spring in November. Buenos Aires is a wonderful city and recently they’ve been going through a financial meltdown again so their currency has dropped a lot, making things unusually cheap again. You could spend 3 or 4 days in Buenos Aires and the rest in the Mendoza wine country or Iguazu Falls or Bariloche for some adventure. From everything I have heard it’s all safe and civil there, so it’s just a matter of the local currency going down in value.

The rainy season in Cartagena winds down by early November, so this is an ideal time to come, especially toward the end of the month if you can get cheap airfare before and/or after Thanksgiving. The temperatures are pretty much the same here every day of the year, so the key is to work around the autumn rainy season to when it's dry but before hotels fill up.
If you are referring to days trips and that sort of thing, it will be much cheaper if you book once you get there. In Vietnam in particular it’s amazing how cheap tours can be if you book them through your hotel. I once did a 6-hour bus tour to Mỹ Sơn, which is near Hoi An, and I think I paid about US$6. It even included a boat ride and a basic lunch. That same day tour online would probably cost US$30 because the booking company takes a share and there is very little competition.
Visitors travel from around the world to experience Nuremberg's iconic Christmas Market. "Christkindlesmarkt," as it's called, is a tradition that dates back to 1628 and features more than 180 stalls. Though you could easily spend several days wandering the market, there are plenty of other things to see in the area, namely museums—Nuremberg is home to 43 of them.
Venice can get pretty cold and they also have those famous Acqua Alta floods in winter, so read up on that before you go. But Rome and Munich should be easy to visit in December. One suggestion I will make is to consider visiting Rome for 3 or 4 nights and then base yourself down on Sorrento for the remaining 2 or 3 nights. Rome is one of those cities that is crowded and chaotic even in winter, to the point that just crossing the street can be frustrating, so many people get tired of that after they’ve seen the main sights. And Sorrento, on the other hand, is a lovely small city that is close to Amalfi, Pompeii, Naples, and the Isle of Capri, so it’s an ideal base to visit all of those. Sorrento is also cheaper than Rome, and a surprising number of locals speak English there, so it’s easy and pleasant. That time of year I’m not even sure if the tourist buses are running to Amalfi, although the local ones will be.
In SE Asia you have many choices, but probably the best choice for a family would be Phuket, Thailand. It’s more expensive than Goa, but the infrastructure there is much better. Patong Beach is the biggest town on the island and the main tourist hub, but for a family I’d recommend Karon Beach or Kata Beach, both of which are just a bit south of Patong, and both lovely.
This is a difficult question to answer without quite a bit more information. First off, it’s obviously going to be pretty cold in most of Europe that time of year, although most of the major cities aren’t known for accumulations of snow. As long as you are okay with cold weather then it’s mostly down to budget and your main interests. I’m guessing that you haven’t been to Europe yet since you didn’t mention any places that you’d prefer to skip this time.
Unlike most cities on South America's west coast, Buenos Aires has fairly consistent rainfall all year long, and you might see a bit of the wet stuff even during December. Still, the temperatures should be ideal for being outdoors, and this is really mostly an indoor city anyway, so when it does rain you'll be able to pop into a shop or museum or cafe and have a great time.
Keto Diet practitioners who overeat a little on vacation shouldn’t chastise themselves too harshly. Life is about balance, and the Keto Diet helps practitioners regain control over their eating habits, but it shouldn’t be an overbearing burden. As long as you can get back to your diet plan after vacation, and you don’t use your holiday as an excuse to go back to your old way of eating, eating outside of what your Keto Diet plan recommends doesn’t have to be a huge problem.
All in all, it was so easy to stay on track. I think making my mind up beforehand helped, and I didn’t make a big deal out of it. No one else in my family felt deprived, and our trip didn’t revolve around what I could or could not eat. I did decide to have a cheat day on our last day of vacation, and I’m okay with that. One day for me is much more manageable than eight. Afterward, I will jump right back on track. If you decide to follow a keto/low carb eating plan on vacation, know that you are capable and that it doesn’t have to be hard. I think so many make it harder than it is with so many extra rules that it is easier to give up. Do whatever is simple to you. If researching restaurants and making a plan ahead of time fits better in your personality, do it. If you are a bit ADD, like me, and planning causes stress then follow my off the hip craziness. Taking steps to simplify the process and not being too hard on yourself will be crucial to success. If you eat two of your kid’s french fries at dinner, don’t beat yourself up! At least you didn’t eat all of them. On the other hand, if you ate all of them, push the reset button and start over the next day. I followed the steps above, and then I gave myself grace. I’m happy to say that I am came home feeling great, I am enjoyed my one day off plan, and now I’m right back on track!

Vietnam might fit the bill for what you are looking for. The most popular itineraries are to start in Hanoi and end up in Ho Chi Minh City, or the other way around. There is a nice train connecting them that is scenic in many places, and the best must-stop place in between them is Hoi An. You also don’t want to miss Halong Bay, which is just outside Hanoi. Vietnam mostly attracts cultural travelers rather than party people. The food is excellent (France used to run the place) and there is plenty of culture all around, in addition to some nice beaches in Nha Trang and Da Nang (next to Hoi An).
Traveling during the last ten days of December means crowds and exorbitant prices throughout much of the world, but the first two-thirds of the month—before holiday airfares and hotel rates go into effect—can be a serene, value-laden, and just plain lovely time to vacation. Europe is all decked out for the holidays—with locals generally friendly and in high spirits; in the Southern Hemisphere, spring is in bloom; and in the Caribbean, Hawaii, and Mexico, hurricane season is over, the weather is gorgeous, and there are free upgrades galore.
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