If you are interested in free camp sites, or very cheap camping, freecampsites.net is the place to look! Camp areas are usually uncrowded and in beautiful locations. I camped at Idaho Pipeline access campground which was on BLM (Bureau of Land Management) land. This area was right off the highway and on a very quiet river. I was the only one there! I really enjoy seeking out BLM and other free spots.
I rode my bike to see Twin Falls, very large and stunning waterfalls. Two miles into my bike ride, I somehow popped both my bike tires. So, with two flats, I stubbornly pushed my bike for an hour till I got to the waterfall. The waterfalls were worth the push. The trees were starting to change colors to a golden yellow and the weather was perfect, not too hot, not too cold. After spending some time at the falls, I eventually had to hitchhike back to the bus and drive back to pick up my poor bike.
Idaho was a pleasant state to drive across, but I did spend a lot of time alone here. Found some lovely free camping spots, quirky places to explore and kind folks. At a farmers market, my first day there was the first time I had ever seen an unwaxed apple. Yes sounds strange but all supermarkets wax their apples in California.