Unsurprisingly, the end of December is the beginning of the peak season for resort prices, so those who are able to come earlier in the month will be getting better deals. Still, the all-inclusive resorts are locked in heavy competition all year so this area can be a great deal compared to the alternatives, even in high season. If you are looking for where to go in December for an all-inclusive beach holiday, this is your best option for most people.
As you suspected, this is a tricky one. Most of the places that would work for you are having a very rainy month in November, so it’s not a good time. Thailand would actually be a good choice if you can deal with the travel time. The rainy season there ends in October and yet the crowds don’t start appearing until December, so you get low hotel prices with nearly perfect weather. As mentioned, all of the good options in Central or South America have a wet season in November. Argentina could be a good option, as November is late spring there, and it has everything you are looking for. The flights to get there are also fairly long though.
As the year winds down the parties amp up, none more so than in Scotland’s capital, where Hogmanay celebrations see flaming torches, fireworks displays and night-long parties take over the usually quiet cobbled streets. Slightly more sedate, the Caribbean’s southernmost island Trinidad simmers with stirring Spanish-style musical performances as the locals usher in the start of the dry season.
Bali is wonderful, or at least parts of it are, but they now have a volcano issue and those flights are very long and never cheap. Machu Picchu is incredible, but it’s a place you visit for half a day or so, and they actually have their rainy season at the end of the year, so it’s actually not one of the better times to go. Actually, you might consider a trip to Argentina, which is warm that time of year, though rarely scorching. Buenos Aires is a wonderful city that is pretty good value now, and you can also visit the Mendoza wine region and Iguazu Falls and Bariloche, which are all even a bit cheaper than Buenos Aires.
Cancun is at the north end of the Riviera Maya, which also includes the island of Cozumel, so this is a huge area with over a thousand hotels to choose from. All that competition keeps prices down until the high season begins, so November is still a buyer's market. There are even ruins nearby and other cultural opportunities, so it's not all about sitting on the beach here. If you prefer a high-rise hotel overlooking a beach then stay in Cancun itself, but if you prefer to stay in a friendly town with many restaurant and shopping choices then head to Playa del Carmen, just a bit to the south, instead.
Never thought of Moscow as a Winter destination! It is quite the place to go especially after the world cup hype. I second Rajasthan, India as one of the best places to travel in December. Love this list, Wendy. I have even listed Rajasthan and other offbeat places to travel in December and January over here: https://www.thegonegoat.com/inspiration-and-tips/2018/11/29/the-best-places-to-travel-december-january
When it comes to flights over the Christmas holidays, you should book as early as possible. The airlines know they can fill every seat at a high price so they don’t have an incentive to lower fares like they do for flights in January or February. Air Asia now flies from the US to Asia and at good fares. Aside from them it’s just the major airlines as well as some Chinese airlines that do those routes.
If you are looking for a cheap, beautiful, and relaxing beach destination during December then Goa is ideal. This has become hugely popular with package tourists from Europe and Israel (and more recently Russia), and the facts that pretty much everyone speaks English and there aren't many cultural opportunities means that it's a perfect place to just vegetate in a beach chair for a week or two.

Thank you so much for the kind words and I’m always happy to hear that people find this information useful. As far as Turkey in December is concerned, I wouldn’t recommend it. I actually lived in a small town near Antalya on the Mediterranean for a bit over a year and I was surprised by the fact that almost everything closed down around 1-November and didn’t start opening again until March or April. Actually, I think Istanbul would still be enjoyable in December and so would Bodrum or any of the other larger cities including Antalya. But anywhere on the coast will be a ghost town and I’m pretty sure that Cappadocia would also be mostly shut for the winter. Ephesus probably stays open, but similar to Cappadocia, the attractions are all outdoors and they can get pretty fierce rainstorms in winter.
If an apartment isn’t your thing, or you have to book a hotel for your business trip, then there is one upside: the food. Typically hotels will include some sort of breakfast, and occasionally some sort of dinner plan. In Portland, we stayed at a great hotel that included both. Breakfast usually consists of pastries, waffles and oatmeal – but they almost always have eggs, bacon, and sausage ready to go on your plate.

December might be the only month of the year in the Canary Islands where very few people would consider sunbathing. Still, compared to everywhere else in Europe, Tenerife is balmy. The largest and most English-speaking of the Canary Islands, Tenerife is no mystery to the hundreds of thousands of northern Europeans who spend a month or more here every year.
Hotel prices definitely go up in around Christmas so it's best to come early in the month if that's possible, but it's still a pretty good bargain even during the peak weeks. Book early if you can because the better and cheaper hotels will fill up first, of course. Also consider a side trip to the Mendoza wine region, Patagonia, or the amazing water falls of Iguazu.
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.
If you’re a bit more on the timid side, you can always use Yelp and TripAdvisor to get good insights on places people have visited. As a disclaimer, some of the ratings may not be accurate on these sites, so make sure you go through and read some of the more recent reviews that people have written. We did this for a few of the places we visited and had no issues.
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