Backpacking!

[Pirate Bill]

I'll second what everybody else has said and add:

Take a map of the area, preferably topographical with marked trails. And a compass or GPS. Learn how to use the compass or GPS and map.

Comfortable shoes, thin "liner" type of socks (not nylon), thick padded socks. This combo will help prevent blisters. The liner socks wick away moisture (polypropylene is best) and move with your skin to reduce friction. The padded socks provide cushion and comfort. The comfortable shoes should be worn in, not brand new. If you buy new shoes wear them for a week everywhere you go.

Make sure your first-aid kit has moleskin. Use it on "hotspots" if you do start to form blisters.