Winter in Alaska is the ideal time to experience the aurora borealis, also known as the Northern Lights.
If you want to warm up a bit with a tropical winter getaway, look no further than Hawaii. Hawaii in December is usually in the low 80s and has wonderful breezes.
The warm ocean waters keep Marathon Key a warm 85 degrees throughout the year. Swim, snorkel, dive, or motorboat around the key either on the Gulf or Atlantic side.