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Most of South-East Asia will fit your description of the destination you want, including Malaysia, Singapore, Indonesia (these more so, since they are near the equator); and to a lesser extent Cambodia, Thailand, and Vietnam. You could also probably fly to Australia / New Zealand for similar fares enjoy their summer season.
November to March is roughly the time when many places near the equator in SE Asia have their rainy season, though this is highly variable. Take a look at what the weather is now - if it's already raining there, it will probably continue. Otherwise pick any destination in SE Asia you get the cheapest flights to!