Another good thing to do is if you are going into the woods or trails that you are not familiar with and a ways away from your car. Always mark where you left the the car on the GPS as a waypoint. Trust me, it helps if it gets dark or you get lost or turned around. Ohh yeah I learned the hard way. LoL!
Bug Spray, Compass, camera, first aid, whistle, extra batteries, trade items, cell phone. Water to drink and something to eat if your gonna be out long. Have fun! Be safe.