ALWAYS ALWAYS! Leave your plans (including a map) with a loved one or friend. Let them know when to expect you back. Don't deviate from your plan. If it's possible that you won't be where you said you would originally be, then you better include that info too. Consider getting some good two way radios and give them one of them. Take everything you need to help you be found, or don't go! All boy scouts know these rules. Take back-up. Extra water or a way to purify it, sharp knife, batteries, cordage, compass, a way to make fire, more than one way to signal for help (mirror, whistle, flares, large bright ground cloth, etc). Use your head. Be aware of everything around you. Listen to your inner voice if it says "This is a bad idea".