Blitsters - mole skin or duct tape. Or wear toe socks if blister

Mole skin or duct tape should be put on before you get blisters if you know where you tend to get blisters.
Toe socks -
http://www.rei.com/product/849889/injinji-sport-lightweight-toe-socks-girls

For hiking, wearing thin liner socks also helps prevent blisters.

Shoes are important to protect your back and knees.