Night photography was always sort of a favorite of mine; dark backgrounds plus some sort of illumination almost guarantees great looks. Nowadays, DSLRs have reached a price-performance range where one can achieve things previously even very difficult with film cameras.
If you can’t sleep at night or are planning a night away from civilization (read away from stray light) then consider bringing your camera and tripod along! Have a look at this article written by Floris van Breugel for a comprehensive guide on how to achieve some spectacular star-trail shots. His examples speak for themselves!
Meanwhile, I’m out in the countryside, camera in tow!