There are many other Thai islands that could also be ideal and have what you are looking for. Another option is Boracay Island and I mention it because I spent an evening hanging out with some guys visiting from Saudi Arabia and they liked it a lot. The weather won’t be “cool” but it should be nice, and they do have very good nightlife in the Boat Station 1 area.
Far from the crowds and heat of summer, a visitor to Rome in December will find that it’s a lovely time there, with fewer lines at popular tourist spots, more attractive prices, and a chill in the air. With a warm jacket, comfortable shoes, cozy hat and gloves, you’re ready to explore the Eternal City. Stroll through the main streets to enjoy colorful lights, decorated trees, and Nativity scenes. The Piazza Navona hosts a Christmas market, and stores welcome shoppers with longer hours and attractive displays. Rome’s Jewish community celebrates Hanukkah with a large Menorah in Piazza Barberini where candles are lit each evening of the eight-night holiday, this year from December 2–10. The Catholic community celebrates the Immaculate Conception on December 8 when the Pope leads a procession from the Vatican to the Piazza di Spagna. December is the perfect time to visit the Vatican Museum, Sistine Chapel, St. Peter’s Basilica, Colosseum, Trevi Fountain, and museums that are usually filled with tourists during warmer months. Even without crowds, it’s still most convenient to book ahead through a tour company such as City Wonders or Access Italy, for no-wait entry, professional guides, and early admission. Food is always one of the great pleasures of a visit to Italy, and in December, a warming plate of spaghetti carbonara or hot chocolate and seasonal panettone taste especially good. The new Pantheon Iconic Rome Hotel, Autograph Collection is a convenient home base in the center of the action with a beautiful rooftop overlooking the Pantheon. 
Those wanting to hike to Machu Picchu will also find this to be an ideal month, since getting in a group will be easy even without much advance notice. The train to Machu Picchu is expensive year round, and reservations should be easier to get the day before this time of the year. Hotels are always cheap in Cusco so you can afford to get something nicer than you are used to this month.
If you really want to see the city up close, visit in November or December, when the crowds have dispersed. Hotel prices are comparatively low, and gondoliers are more appreciative of customers. And once you have your fill of religious art, head for the Peggy Guggenheim museum, which displays 20th-century American and European art in a home and garden setting. Note: October through January is the time of acqua alta, when Venice may flood. Usually it's not severe, and the city puts up wooden walkways for visitors and residents to traverse the water.
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.
Really my first bit of advice is that the best place to get a really nice hotel that is on a beach or a hill and has the other nearby and also has great weather in December is Phuket, Thailand. You could go almost anywhere in southeast Asia in December and get good weather and low prices. But Phuket has over 1,000 hotels and hundreds of those are wonderful fairly luxurious hotels or villa complexes that could be perfect for a romantic honeymoon stay.
There are snack stands everywhere at the theme park, and I can tell you from the experience of at least yearly visits that most choices at the stands are decidedly NOT keto-friendly. In recent years they’ve added what I’m sure they consider “healthy” choices, but most of those consist of yogurt and fruit with dip. You may, upon occasion, come across some carrots and celery with dip, but it’s very hard to find.
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.
If those flights are too expensive you might think about going somewhere else in Mexico or to Costa Rica. The area around Cancun including Playa del Carmen and Tulum and Cozumel has a LOT going on. And if you’ve been there you could instead go to the Puerto Vallarta area, which is very different and also great. For activities though it’s hard to beat Costa Rica. I think they invented zip-lining and the country is about one-third national parks with all kinds of fun activities. Let me know if you have any other questions. -Roger
Trekking in Nepal during peak season might not sound like the most sensible choice for penny-pinching backpackers. But you can still enjoy the ideal weather without spending a fortune on in-demand hotels and expensive permits if you're happy to swap big-name trails, like Everest Base Camp and the Annapurna Circuit, for quieter treks to Kanchenjunga Base Camp and around the Langtang Valley. Idyllic conditions (dry but not witheringly hot) are also on offer in Rajasthan, one of India’s most vibrant and varied states. Chug between notable, attraction-rich cities like Jaipur, Jodhpur and Udaipur on an atmospheric and wallet-friendly Indian train, snacking on spicy pakoras and sipping sugary chai en route.
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