Surprising to some people, December can actually be a bit cool in Mexico City, especially at night. Its elevation keeps it mild all year, but at least the rainy season is totally over by December, so it's an ideal month for a cheap cultural holiday, perhaps combined with a trip to one of Mexico's many beach resorts. You can get cheap flights between Mexico City and Cancun or Puerto Vallarta, for example.
Hotels in Buenos Aires are starting to reach their summer peak prices in November, especially toward the end of the month, but still they are a fantastic bargain by European or North American standards. The weather in November is also pretty much perfect, and while there's always a threat of rain in BA, it's mostly an indoor city so it shouldn't be too much of an inconvenience.
The best places in December with good weather and that are inexpensive and also fairly close to India are Sri Lanka and Thailand, and they are both mentioned in the article above. Sri Lanka is obviously closer and you have many nice and scenic areas in the hills as well as the beach areas along the southern coast. But Sri Lanka has many similarities to India, as you may know.
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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.
Thanks for all of this Roger! It looks like in the comments you mention Portugal a couple times and I wanted your opinion – we’re looking at the first two weeks and probably focusing on Lisbon to Porto (since we know it will be too cold to do the beaches in the south). While Portugal seems to be highly recommended, I keep seeing conflicting information about November being rainy – we definitely don’t want to spend 2 weeks in the rain but in your experience what are the chances of that? Thank you!!
In India I’ve always had good luck with the trains by booking at least a couple days in advance, and also being flexible and only going when an AC3 ticket is available. As you know, the actual train stations are nightmares. But every hotel has a person who can fetch a ticket for you by going through the back door and bribing someone at the train office. Like a AC3 ticket might cost US$20, and for an extra US$4, your hotel will go buy it for you and it’ll be waiting at the front desk later that day. It’s a pretty sweet system.
Since you mention the temperature in Fahrenheit, I’ll assume you are in the United States. You might have to go to the Southern Hemisphere to reliably get 84F or higher, but you can get over 80F in most of the Caribbean. You’ll get low 80s in Hawaii in early December as well. Fortunately, neither of those places get too crowded until just before Christmas, so either should work.
Aside from Indonesia you might also consider Thailand, which has great infrastructure so it’s much easier to travel with young children. Phuket has by far the most options, and its rainy season usually ends in early November. For families I recommend Kata Beach and Karon Beach, which are both just south of the main shopping and nightlife town of Patong Beach.
Even if you can't sunbathe, the weather is still reliably pleasant all the time, with almost no rain. Weekly and monthly apartment rentals here are very popular, but there are plenty of hotels and hundreds of restaurants for those coming for shorter periods. If you want to be with the most English speakers you'll want to focus on the southwest area of the island around Los Cristianos and Playa de la America.
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.