If you’re pretty simplistic when it comes to food, you can always bring nuts with you. They last long, they taste great, and they’re packed full of fats (if you choose correctly). Macadamia nuts and Brazil nuts are among the top high-fat nuts out there, and they’re well worth the extra cost if they save you from an accidental cheat right at the end of a great vacation.
Oh, did you want a sunny tropical vacation that doesn’t require a passport? Done. Hurricane season is over, flights are cheap, and the water is still warm enough for swimming (and scuba diving). Almost all the tourists come here via cruise ship, which means you’re mostly not competing with them for hotel rooms -- Windward Passage, Emerald Beach, and the Bolongo are all open for business after Hurricanes Irma and Maria last year. On December 16 you can catch Jazz By The Sea down at Coral World Ocean Park, and on December 21 watch the St. Thomas Lighted Boat Parade, where contestants (boats) are judged on lights, originality, and holiday cheer.
Mid- to late-November welcomes warm, dry sunshine with temperatures of about 80 degrees in this subtropical Central American nation located south of Mexico. You’ll slip in before the holiday crowds and enjoy exceptional weather and affordable prices for tours and fine lodging. White sandy beaches, friendly native people, jungle adventures, and tours of ancient Mayan ruins await visitors on this small and easy to navigate paradise. Nov. 19 is Garifuna Settlement Day, a celebration of the Garifuna people, descendants of African slaves and native Carib islanders. All are welcome to participate in dancing, parades and tasting traditional foods.
You still get warm ocean breezes and 70-degree temperatures, plus the Hawaiian islands go all out for the holidays. Locals host potlatch-style parties where the Christmas goose is replaced by a luau pig, and the resorts deck themselves out like tropical North Poles, including a massive tree-lighting ceremony at the Outrigger on Oahu and tree-decorating contests at Mauna Kea on the Big Island. Residents there climb to the top of the 13,000-foot-tall volcano, shovel snow into their trucks and speed back down to build snowmen in their yards before it melts.
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.
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.