The truth is, Rio de Janeiro will make this list for at least 8 months of the year, as the weather is always pretty good and the prices are still reasonable compared to Europe and North America. November is still well into the sweet spot, as the high season for hotels doesn't begin until December. This means bargains are often available at some of the luxury places along the beach, which won't be true again until April.
As you suspected, this is a tricky one. Most of the places that would work for you are having a very rainy month in November, so it’s not a good time. Thailand would actually be a good choice if you can deal with the travel time. The rainy season there ends in October and yet the crowds don’t start appearing until December, so you get low hotel prices with nearly perfect weather. As mentioned, all of the good options in Central or South America have a wet season in November. Argentina could be a good option, as November is late spring there, and it has everything you are looking for. The flights to get there are also fairly long though.
One of the best things about Puerto Vallarta is that, unlike most of the Caribbean destinations, this is a real historic town rather than a purpose-built resort community. That means that there are small and authentic (and cheap) restaurants catering primarily to locals, so you get a much more authentic experience if you prefer one. The hotel zone close to the airport is modern and posh, but you are a short taxi ride away from the lovely center of town.
If your real goal is to sit on a European beach and not freeze or be alone in December, your only real choice is the Canary Islands. Tenerife is the largest of them, and the best one for English speakers. The average high in December there is 22C with 16C as a low, and in December it’s packed with Swedes and Brits and Germans who actually do sit on the beach or around pools, even though it’s a bit cool for most of us. It’s important to note though that the Canary Islands are technically part of Europe because they are a territory of Spain, but only the largest cities on each island are “European” at all. The beach resort areas are quite generic, and not very special aside from the pleasant weather and modest prices.
The three places that jump out to me are the Playa del Carmen area just south of Cancun in Mexico, the island of Puerto Rico, or Costa Rica. All of those have endless beach activities and sights and great food and everything else, and they are all well within your budget. Puerto Rico would be easiest, and probably my first choice. Costa Rica is better known for adventure activities that might suit the younger ones. There are several good resort areas along the Pacific coast that would work.
Haveb been to kerela, Pondicherry, etc. we have coevred India a lot as we travel a lot and like exploring the world. We wanted to step out of India for this holiday. I was thinking of Maldives or Malaysia. 4-5 hour flight should be manageable but extending that more would be stretching it a bit i guess. So heer i am still confused and lost. Thaailand is an option again as there are several beaches which are serence and unexplored but i would not want to go to Phuket as its very crowded and touristy. Can you suggest a better island in Thailand which is quite, blue green water and less crowded.
Southeast Asia is easier to deal with, and there are cheap flights connecting in the Middle East and landing in Bangkok, Kuala Lumpur, and Singapore. Each of those is a very interesting city, and there are many smaller places to go in the same region. In Malaysia there is Penang and Melaka. In Thailand there is Chiang Mai and quite a few others in that area. In Laos you can visit Luang Prabang, which sounds like it could be a winner for you. And there is also Siem Reap, which is home to the amazing Angkor Wat temple complex.