Bring a bag, pick up garbage. Heck, you don't even have to bring a bag, half the time -- find one, and make it your geotrashing bag.
Geotrashing may make landowners more willing to permit access for Geohashing if combined with a good-will gesture such as litter-picking.
Earn the Geotrash achievement while you're at it.
- Cache In Trash Out from geocaching.com