Traveling in December means you either fully lean into the holiday season, or else escape it entirely and flee to somewhere warm. Personally, I try to appreciate the cold weather while we have it and max out on warm seasonal beverages, colorful lights, soft snow, and good company. True, some places are overwhelmed by the capitalist engine that powers Christmas, but you can still get a non-denominational-winter-wonderland fix, if you know where to look. No matter your travel preference, there’s a perfect place in this world for you to bask in those final sunsets of 2018.
The Canary Islands are always an option and the weather in November is pretty decent. I spent almost a month on Tenerife a couple years ago and I thought the nightlife was mostly pretty cheesy, although at least the drinks are cheap. I think in summer the nightlife there might be good, but in the other months I think it’s pretty quiet because it’s mostly older visitors from northern Europe.
You’ve got a pretty good budget so you can afford to go almost anywhere, assuming you are okay with renting one or two houses or villas instead of 4 hotel rooms. If you are willing to fly all the way to Asia, your best bets would be Bali or one of the Thai islands, probably Ko Samui or Phuket. In all of those places you should be able to rent a house or villa near the beach and then do activities and day trips very easily.
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.