If you are mainly just looking to relax, you've found the perfect place, with warm weather and amazing off-season deals. The all-inclusive resorts tend to be much cheaper in the long run, although they do make it more difficult to experience the local culture and explore the whole island. If you don't care about leaving the resort and you want the best all-inclusive value in the Caribbean, head straight to Punta Cana, which is mentioned just below.
Warm weather, Caribbean beaches, and fascinating history beckon visitors to this coastal city during December. Once a 16th-century Spanish port, Old Town Cartagena, surrounded by ancient stone walls, is a UNESCO World Heritage site. Visitors strolling through its streets will see original Spanish Colonial architecture among new restaurants, restored homes, and boutique inns. From street food to upscale restaurants, Cartagena offers the best in local seafood, meat, and fresh fruits. In December, the city becomes a festival of lights, with nativity scenes, decorations, and holiday celebrations culminating with New Year’s Eve fireworks. Holiday shoppers will want to take home gifts of colorful handcrafts sold at markets throughout the city, with special Christmas markets arriving in December. Colombia supplies nearly 90 percent of the world’s emeralds, and a quality gem from a reliable source would make a memorable keepsake. Nearby Rafael Nunez International Airport makes arriving by air quite convenient, and visitors will find a range of lodging in and around Cartagena. For a luxurious vacation, the new Conrad Cartagena offers four pools, a private beach club, a golf course, seven restaurants, tennis courts, a spa, and stunning ocean views from every room.
By the way, Costa Rica is quite different from the popular countries of South America itself (Peru, Argentina, Brazil etc), so it’s a different experience and not much of an introduction. I think in 12 days you could have a great time in several areas of Costa Rica, and maybe also spend a few of those days in Panama or Nicaragua. As always, feel free to ask more questions if you have them. -Roger
If the Caribbean sounds better, I’ll recommend Puerto Rico. The area around San Juan is fairly crowded, although not nearly as crowded as a typical resort area that is loaded with hotels. And there are many smaller resort towns on other parts of the island where people usually rent a condo for a week or two. In a town like Rincon you won’t get crowds, and you will get great beaches.
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’re a bit more on the timid side, you can always use Yelp and TripAdvisor to get good insights on places people have visited. As a disclaimer, some of the ratings may not be accurate on these sites, so make sure you go through and read some of the more recent reviews that people have written. We did this for a few of the places we visited and had no issues.