Sun setting too early for you?
Try "night caching".
These are caches specifically meant to be found at night. Hiders often add clues that can only be found after sundown -- using reflectors and other items, usually indicated in the cache description.
You can find some of these by searching for caches in your area using the word "night" and by looking at the cache "Attributes".
Premium Members of Geocaching.com can also do a "Pocket Query" to search according to attributes.
Bring a flashlight!
For more Geocaching info (Clubs, Videos, News!) go to FirstToFind.net!