Gorgeous weather, an enviable winter suntan, and thriving dining and nightlife are obvious reasons for heading to Miami in December. Art Basel Miami Beach 2018, a contemporary art extravaganza and America’s premier art fair, is another incentive for a Miami trip. With celebrities, parties, and unmatched celebrations throughout the city, over 250 world-renowned galleries and 4,000 participating artists will display their creations and collections. The Betsy South Beach, centrally located in Miami Beach’s Art Deco district, will be a major Art Basel venue. Another noteworthy accommodation is The Setai Miami Beach, situated oceanside in South Beach. Featuring 87 Art Deco rooms and 49 ocean suites, the Setai will debut five new retail stores by the end of the year. There is no shortage of family-friendly fun in the Magic City, so named for its rapid growth from 1,000 residents to over 5 million in the past 120 years. Santa’s Enchanted Forest at Tropical Park is the largest holiday theme park in the world featuring carnival rides, shows, games, race cars, food, holiday displays, music, and dazzling Christmas lights. The Miami Lantern Light Festival at the Fair Expo Center celebrates Chinese culture, featuring food, acrobats, handmade souvenirs, rides, and huge handmade lanterns symbolic of illuminating the future and the reunion of family. 
The island has made a miraculous comeback following Hurricane Irma, and by November, nearly all of the restaurants, villas, and hotels will be back up and running. Most regulars missed out on holiday season in 2017, however, December is bound to be crazy—but if you plan a trip just before the chaos, you're golden. Many of the luxury properties that were damaged have completed renovations, so expect everything to be shiny and new. While you really can't go wrong with any of the hotels, we're partial to Le Toiny, thanks to its uber-private accommodations, spacious villas, and over-the-top attention to detail.
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.
Without knowing more about your interests, my top suggestion would be to focus on Sydney and Melbourne and the areas around both. The Blue Mountains near Sydney are also nice for a couple days or so. The main challenge you’d have in seeing a lot of Australia is that it’s all so spread out. You can hire a car for Melbourne and Sydney and that whole area, but it’s better to fly to get to Uluru (near Alice Springs) or Brisbane or Cairns/Great Barrier Reef or Perth. You’d be driving for days in between those places if you started from the southeast area where most people live.
When you mention, “not too touristy”, the first thing that comes to mind is San Juan, Puerto Rico. I’m not sure if you’ve been there already or not, but one great thing about it is that the “tourist” areas close to Old San Juan are filled more with apartments than with hotels, unlike Cancun, where it’s nothing but hotels and timeshares. I can highly recommend the Condado neighborhood, which does have some large hotels but is mostly apartments for expats and seasonal visitors. There is even a free bus that goes from there to the heart of Old San Juan, which is a gorgeous colonial town filled with great restaurants, bars, and interesting attractions. 

I think the best place for what you want is Thailand. You can choose from Phuket or Ko Samui or one of many other islands, and they all have nice beaches and good nightlife at a very reasonable price. There are other places in Asia that have warm December weather, but Thailand’s tourist infrastructure is better than the others so it’s just much easier to get around and do what you want. Let me know if you have any other questions. -Roger
The park we visited has an app you can download on your phone that allows you to reserve a table at any table service restaurant on their property ahead of time. The app also lists the daily breakfast, lunch, and dinner offerings at every single food establishment on site. There really is no excuse for settling for the popcorn or french fries when you can easily find a place with compliant options if you’re willing to look and tweak a bit. A lot of other theme parks are either offering similar apps or putting their information online for those who need to research their options ahead of time. If your destination is the beach or a famous city, check out what’s in the area online, or call your hotel to get an idea.

As for Malaysia, you could book online and it might cost a bit more, but more things go by a fixed price in Malaysia so it might not be much different. Personally I’d probably book tours through my hotel once I got there, just as in Vietnam. But there is a BIG difference between the countries in that Malaysia is a much richer country and there are very few scams to worry about. Vietnam is still fairly poor and they were communist for so long that people got used to trying to scam people a bit as the only way of getting ahead. So the good news is that Vietnam is a gorgeous country with excellent food and very low prices on almost everything. But the bad news is that you have to be more careful in Vietnam because people will try to overcharge you if they can, even though it still might seem cheap to you. That’s one reason I like to book with hotels, because they put the reputation of the hotel on the line when they book something for you, and they can’t afford to get a string of bad reviews by charging an extra US$5 on a cut-rate tour. I hope this helps. Let me know if you have any other questions. -Roger
A charming, historic city to visit any time of year, Edinburgh is especially festive during December. Walking through its cobblestone streets takes you back to medieval days when sheep, cattle, and grain were sold in what is now the center of the city. Today, the Royal Mile includes shops, cafes, and museums. Edinburgh Castle, a must for first-time visitors, dates to the 12th century, with its dramatic silhouette overlooking the city. For those seeking holiday celebrations, the Royal Botanic Garden is decorated with lights, music, and illuminated trees. European-style Christmas markets pop up at Princes Street Gardens and George Street, offering traditional crafts, gifts, food, and warming drinks, most welcome during chilly December. The annual Hogmanay celebration welcomes the New Year with fireworks, food, and festivities. Don’t miss the delicious and ubiquitous fish chowder called “Cullen skink,” and be sure to try haggis, served with “neeps and tatties” — mashed turnips and potatoes. Buttery shortbread and whisky from the country’s more than 100 distilleries are also Scottish specialties. A stay at the elegant and historic Balmoral Hotel will enhance any visit to Edinburgh, and while you’re there, you’ll notice that Scottish actor Sean Connery was a guest, as was J. K. Rowling who finished the last Harry Potter book in one of its suites.
You may need to skip the cake, or at least limit your intake of sweets and carb-heavy vegetables. Know your body and do what makes you feel best. If you don’t think you will be able to get back on the Keto Diet comfortably after having a “cheat day” or “cheat vacation,” then perhaps it might be best to continue eating a strictly Keto-friendly diet.
If you’re highly susceptible to the Christmas spirit and haven’t already committed the entire holiday season to wrapping presents with Aunt Linda, consider Cologne. The city has a whopping seven main Christmas markets -- definitely don’t miss the Cathedral Market, which has the largest Christmas tree in the Rhineland, or Angel’s Market, where you can sip eggnog punch and weave around people actually dressed as angels; Santa comes through once a week as well… on horseback. All that’s left for you to do is listen to the festive music and browse the stalls for an apology gift to send to Aunt Linda.
Based on your description, you definitely want to go to Costa Rica. The neighboring countries have many similarities, but Costa Rica is the shining star in Central America for tourism. They have endless national parks and nature sights, but also lovely beaches and adventure activities. The area in the north around the town of Tamarindo is the more luxurious part of the country, but there are many other beach towns on both coasts that could work for you. You will also probably want to spend one or more days in the Arenal volcano area, which has many other great activities. The Caribbean coast is more laid back and less family oriented, so better to focus on the Pacific. Have a great trip. -Roger
If this were last year I might have also suggested San Juan, Puerto Rico or Cartagena, but both of those have issues at the moment. If for some reason you don’t like what you see in Costa Rica, there are also some really nice resorts in Panama, especially in the San Blas Islands area. Aside from those you’d probably have to fly longer than you prefer. I hope this helps. -Roger
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