For those from the Northern hemisphere in need of decent a blast of winter sun, the picturesque coastal town of Essaouira is the perfect place to put your feet up and relax. Fresh-caught fish sizzles on beachside grills, whitewashed houses with blue shutters lend a Mediterranean vibe, and you can lose hours wandering through the dozens of art galleries and workshops.
If you are referring to days trips and that sort of thing, it will be much cheaper if you book once you get there. In Vietnam in particular it’s amazing how cheap tours can be if you book them through your hotel. I once did a 6-hour bus tour to Mỹ Sơn, which is near Hoi An, and I think I paid about US$6. It even included a boat ride and a basic lunch. That same day tour online would probably cost US$30 because the booking company takes a share and there is very little competition.
Thank you, and I’ll be happy to try to help. But first I have to mention that ALL of Europe is quite cold in December and there are no beaches that are anywhere near warm enough to even spend time on, much less go swimming. The only place that could possibly fit the bill is the Canary Islands, which is off the northern coast of Africa although technically part of Spain. It’s reasonably warm there during December, and there is quite a bit to do.
As for key events in December, I typically avoid those sorts of things myself, so I’m not a good source on that. I actually visited Rio de Janeiro during Carnival, by accident, and it drives hotel prices so high and also crowds that it’s probably the worst time to visit unless you specifically want to spend all night watching the parades. And Oktoberfest, as another example, literally triples the prices of hotel rooms in Munich, so it’s only worth it if you REALLY want to get involved in the Oktoberfest thing yourself. But plenty of other travelers love to go witness the biggest events, and I assume they love it, so there is no right or wrong.
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.