As for Malaysia, I love it there too, but it has very few nice beaches in the main part of the country (not including Borneo). But now that you mention it, they do have some nice beaches in Penang, which is the best tourist area anyway. If you search for hotels in Penang, make sure that they are on or very near a nice beach. Most of the island does not have sandy beaches, but some parts do.
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It’ll definitely be too chilly in Portugal or Malta to go in the water in November, and Malta has almost no beaches anyway. I really like Malta a lot, but it’s not a great beach destination. It will be warm enough in the Canary Islands, but the flight from Atlanta would be long and expensive because you have to change planes in Madrid. Also, I find the Canary Islands to be pleasant and the weather is wonderful, but it’s kind of boring there compared to the other places we are discussing.
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.
Vietnam might fit the bill for what you are looking for. The most popular itineraries are to start in Hanoi and end up in Ho Chi Minh City, or the other way around. There is a nice train connecting them that is scenic in many places, and the best must-stop place in between them is Hoi An. You also don’t want to miss Halong Bay, which is just outside Hanoi. Vietnam mostly attracts cultural travelers rather than party people. The food is excellent (France used to run the place) and there is plenty of culture all around, in addition to some nice beaches in Nha Trang and Da Nang (next to Hoi An).
Located off the coast of East Africa, the Seychelles—an archipelago consisting of 115 islands—is about as close to paradise as you can get. Crystal clear water, lush jungles, and powder-fine sand make it the ultimate early winter escape, particularly for romantic getaways. Book one of the 30 breathtaking pool villas at Six Senses Zil Pasyon, which is among the region's top luxury resorts. The hotel is situated on a private island that offers prime territory for snorkeling, sailing, kayaking, and hiking—plus, the spa has scenic pavilion-style treatment rooms that are worth the trip alone. Health conscious guests will be particularly impressed by the property's new "Eat with Six Senses" program, which is intended to make travelers leave vacation without the guilt that comes with overindulging. There are four tailor-made treatment plans that focus on sleep, detoxing, fitness, and more, depending on the issues you prefer to address.