Traveling around India is a shock to the system, but it’s not as bad as it looks. If you pay a bit more for the AC3 class on trains (air-conditioned, 3 bunks per side of the compartment), or AC2, it’s pretty comfortable and civilized. Mumbai is worth a couple days before you’ll be desperate to get out, but many parts of Rajasthan are much nicer and fascinating.
If you are aware of what you’re eating throughout the day, you can better plan for indulgences. When traveling to a place that is known for their cuisine, enjoy eating while remaining balanced about your diet. Instead of getting a sweet all to yourself, maybe share it with whoever you are going. By sampling small portions of food, instead of overeating till you feel sick, you can enjoy your vacation food while still keeping your Keto Diet in mind. Alternatively, be sure to get as much exercise as possible (walk to destinations instead of taking a bus or driving), and the extra exertion will help use up any extra calories (or carbs) that you may eat.
If you have a budget that allows at least US$300 per night, you should be able to rent a nice condo in Hawaii. If you haven’t been there before, it’s worth knowing that each of the 4 main tourist islands is quite different from each other, and only Oahu has an urban center that should probably be avoided. You’ll want to rent a car as well, as getting around is difficult without one.
Another option would be Cambodia and/or Vietnam. The town of Siem Reap, which is just next to the Angkor Wat Temples is the real highlight. Phnom Penh is worth a quick look, but not on a shorter trip. Vietnam itself is a wonderful and gorgeous country, and you can see a lot of the highlights in 10 days or so. It’s also very cheap, even around Christmas. You could fly into Hanoi and then go see Ha Long Bay, and then take a train down to Hoi An. After that you could go to Nha Trang for the best beach experience or the hilltown of Sapa. The city of Ho Chi Minh City is quite crowded and you might not like it for more than a day or two.
Bali is wonderful, or at least parts of it are, but they now have a volcano issue and those flights are very long and never cheap. Machu Picchu is incredible, but it’s a place you visit for half a day or so, and they actually have their rainy season at the end of the year, so it’s actually not one of the better times to go. Actually, you might consider a trip to Argentina, which is warm that time of year, though rarely scorching. Buenos Aires is a wonderful city that is pretty good value now, and you can also visit the Mendoza wine region and Iguazu Falls and Bariloche, which are all even a bit cheaper than Buenos Aires.
If you are really only going for 4 or 5 days you only have time to visit one or maybe two cities anyway. I’d say that Lisbon would be ideal and you’d have time also for a short visit to Porto or the Algarve in the south, or at least the historic small town of Sintra, which is near Lisbon. Lisbon has fantastic weather for Europe and it’s a lovely city with plenty to see and do.
Depending on where you are going on vacation, you may have a measure of control over what you will be eating. For Keto dieters who are staying at a hotel and will be traveling from tourist spot to tourist spot, check with your hotel and see what kind of meal options their restaurant offers or whether there’s a continental breakfast. There may be fewer Keto-friendly options to choose from, but you will likely be able to find something to enjoy. Also, when out traveling, be sure to stop at grocery stores and purchase some Keto-friendly snacks that travel well, such as cured meats or cheeses, which can help keep you from overindulging.