Lodging and food would be your largest expenses, depending on your budget and desires. It's hard finding hotels with rates less than $60/night nowadays and you can easily spend $100 or more. Camping out at state parks runs about $20/night around here and private campgrounds usually cost more. Eating out at fast food joints would cost at least $20/day and you easily double those costs eating at nicer restaurants (and by nicer, I mean local diners and cafes). Cooking your own food should save money, but then you have to carry food, cook set, utensils, etc. Personally, I wouldn't enjoy surviving off peanut butter, Clif bars and ramen noodles day after day.