$60 a night for hotel is a good average to plan on. Some areas it will be more, some less. If you think $60 is too expensive, stay away from the bigger cities as it will be much higher there.

I would suggest bringing camping gear. Or just buying inexpensive gear at a place like Wal-Mart where you can get a tent for $25-35, sleeping bags for $10 each, etc. Then you can camp...much cheaper and more fun.

Figure about $12-15 for national and state parks, and $15-30 for private camp grounds. KOA Campgrounds tend to be very nice and are all over the country but they do tend to be a bit higher than many other campgrounds. They do provide very nice amenities for the price so they are often worth it.

Hope this gives you some ideas to work with!