If intermittent fasting is part of your low-carb routine, use it strategically to skip meals and make travel simpler. Perhaps you rush to your early morning flight and wait to eat until lunch. Or, eat a hearty low-carb breakfast before leaving home and don’t eat again until dinner at your destination. One nice thing about fasting is that you can do it anywhere.
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.
If you are looking for a place to go abroad for a few months starting in early December, you are right on the money with Thailand as the best starting location. The weather is really nice that time of year, and it’s quite easy to keep things extremely cheap if you need to. Many of us in the travel writing community have spent months or years traveling around southeast Asia, and I’ve probably spent close to two years there myself. Bangkok is the obvious place to start and it’s an amazing city. After that you can either go north to Chiang Mai and Chiang Rai and then over to Laos, or you can head south to one or more of the islands. Cambodia has a lot to offer, and especially in Siem Reap, and Vietnam can be entertaining for all three months of your first visa there.
We were able to sit down in the store, relax, and eat our salmon and cheese (pictured above) – separately of course! As you eat, you can watch them hand make their cheese through a glass window, showing exactly what they do in their process to get the food you’re eating in front of you. An experience in itself that I definitely would recommend to anyone visiting this city!
If you are interested in a place that isn’t focused on beaches in that area then I’ll point you to some recent answers just above where I mention the charms of Chiang Mai in northern Thailand, or Luang Prabang in Laos, and/or Siem Reap in Cambodia. All of those are wonderful places with temples and other sights, and they are quite affordable once you are there as well.
There’s also Mad River Valley in Vermont, another place to spot amazing hues of fall foliage within Green Mountain National Forest, which provides one of the most gorgeous November vacations. Enjoy quiet seclusion in the small towns near and around Central Vermont for a once-in-a-lifetime chance to see autumn’s last breath and the birth of winter white splendor. Plus, November also happens to be primetime for skiers in Vermont and surrounding Eastern states. Enjoy a slice of wondrous heaven this Thanksgiving holiday.
Actually, all of my best suggestions for those things are in the article above. One challenge you’ll have is that all popular tropical destinations have their peak weeks at the end of December because so many people in cold areas have that time off. So flights to Central or South America are going to be fairly expensive, although buying soon can help. For hiking and views I think Costa Rica could be a good choice, or Nicaragua. You could also go to Bariloche in Argentina, though it’s probably not worth going all that way unless you were also going to spend some time in Buenos Aires and such.
Vietnam and Sri Lanka could both be excellent choices for what you have in mind. Both are best for people who already have experience in these sorts of places, which you do. Twelve days could be a perfect length of time for a classic tour of Vietnam, flying into Hanoi and spending a few days there and in Halong Bay (with a possible side trip up to Sapa), and then taking the train down to Denang for a quick transfer to Hoi An. Hoi An is really a wonderful place and 3 or 4 days there would be great. There are good beaches nearby as well. Then take the train down to Ho Chi Minh City for a few more days before flying home from there. You could also do a side trip to Nha Trang (wonderful beaches) or Dalat up in the mountains. Vietnam really is gorgeous and the food is wonderful (French influences remain) but it can be a bit complicated for new travelers because you’ll find that many people you meet are trying to hustle you a bit, particularly travel agents booking trips and tours. The hotels are generally honest and great value, and so are the restaurants. You’ll learn to ignore the annoying people quickly.
In November you can find excellent resort deals all over the Dominican Republic, but Punta Cana is typically the first choice, especially if you are looking for an all-inclusive resort with all the luxury extras at a great price. The resort is actually a collection of little beach areas on the eastern tip of the island, so it's very secluded and well away from some of the confusion closer to the capital city.