Fortunately, it rarely rains at all in Cairo, so even though December is one of the wetter months, that means nothing and you are unlikely to see even a drop of rain. Hotel prices do reach their peak in Cairo starting late in December, so it's best to go early in the month if possible. Egypt is definitely one of the cheapest places to travel in December, and the weather is surprisingly nice as well.
If you are mainly just looking to relax, you've found the perfect place, with warm weather and amazing off-season deals. The all-inclusive resorts tend to be much cheaper in the long run, although they do make it more difficult to experience the local culture and explore the whole island. If you don't care about leaving the resort and you want the best all-inclusive value in the Caribbean, head straight to Punta Cana, which is mentioned just below.
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.