Quote Originally Posted by RanMan22
1. As others have said, always mark your car as a waypoint....
2. Bring a bottle of water with you -- especially on hot days. You may not think you'll need it, but if you get way out in the woods for a longer period of time than you expected, you'll be thankful you have it.
3. Cache with a buddy, if possible. It's easy to slip and fall and get hurt...trust me on this one. Also, believe it or not, it's easy to get disoriented and perhaps lost in the woods -- even with a GPS in your hand.

-RanMan22
Also helps to have your cell phone with you - just in case...