Like so many others on this list, Goa is completely done with its harsh rainy season by the time November begins, yet crowds don't really start showing up in earnest until mid December. If you have the time off then you'd be very happy just finding a cheap hotel in one of Goa's beach towns and just chilling the whole month in great weather and with minimal crowds.
Two other suggestions would be India or Sri Lanka. Except for a few beaches in Goa, neither of those attract the party crowd, and both are excellent for scenery and culture. India is cheaper as long as you minimize time in Mumbai and other big cities, but that is good advice for many reasons. Sri Lanka is a bit better organized, and on your budget it is good value and easily affordable. There are good beaches along the south coast of Sri Lanka, but India is probably better for beaches.
Unsurprisingly, the end of December is the beginning of the peak season for resort prices, so those who are able to come earlier in the month will be getting better deals. Still, the all-inclusive resorts are locked in heavy competition all year so this area can be a great deal compared to the alternatives, even in high season. If you are looking for where to go in December for an all-inclusive beach holiday, this is your best option for most people.
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.
The only other suggestion I have, which gets almost no rain in November, is Goa, India. There are about 20 different beach areas in Goa, and some of them (Anjuna and Vagator) are famous as party beaches, while many others are more mellow and family oriented. It’s also very cheap and beach massages and that sort of thing are excellent value. Let me know if you have more questions about that. I hope one of these things works out for you. -Roger
As for flight connections, Barcelona and Madrid should have decent connections to Toronto and Delhi, while Casablanca (Morocco’s largest airport) probably does not. So Spain is the better choice by that standard. On the other hand, you can get to Morocco by ferry from Spain in a short time, so you could go to Spain and also visit Morocco for a day or two.
However, I also happen to be an athlete and about a month ago I reached the point where I had almost no power, no energy, constant hunger (and “hanger”) and cravings for practically anything bad like alcohol, sweets, carbs, artificial sweeteners or energy drinks. I tried to fight it. I started over multiple times. At one point I just couldn’t stick to any sensible dietary routine for longer than a day or two. Intermittent fasting, OMAD (one meal a day), TMAD (two meals a day) and keto all seemed to stop working.
Oh, did you want a sunny tropical vacation that doesn’t require a passport? Done. Hurricane season is over, flights are cheap, and the water is still warm enough for swimming (and scuba diving). Almost all the tourists come here via cruise ship, which means you’re mostly not competing with them for hotel rooms -- Windward Passage, Emerald Beach, and the Bolongo are all open for business after Hurricanes Irma and Maria last year. On December 16 you can catch Jazz By The Sea down at Coral World Ocean Park, and on December 21 watch the St. Thomas Lighted Boat Parade, where contestants (boats) are judged on lights, originality, and holiday cheer.
If you are looking for something far less developed than Phuket or any other Thai island, Boracay might be for you. This gorgeous strip of sand is a bit out of the way, but partly because of that it still feels only partly discovered. You'll spend your days relaxing along White Beach or walking up and down the sandy paths that serve as the only real form of transport for most people. Many visitors come every year, and quite a few of those never seem to leave.
Trekking in Nepal during peak season might not sound like the most sensible choice for penny-pinching backpackers. But you can still enjoy the ideal weather without spending a fortune on in-demand hotels and expensive permits if you're happy to swap big-name trails, like Everest Base Camp and the Annapurna Circuit, for quieter treks to Kanchenjunga Base Camp and around the Langtang Valley. Idyllic conditions (dry but not witheringly hot) are also on offer in Rajasthan, one of India’s most vibrant and varied states. Chug between notable, attraction-rich cities like Jaipur, Jodhpur and Udaipur on an atmospheric and wallet-friendly Indian train, snacking on spicy pakoras and sipping sugary chai en route.