Get yourself a DeLorme Atlas and Gazeteer for Idaho. If you don't find enough to do there get the Delorme for Nevada and Oregon!
I don't know where you are from but these three states are mostly BLM land and you can pretty much go anywhere without seeing another vehicle all day long or even having to open a gate......
Down by Murphy Hot Springs, anywhere in the Owyhees, go to Atlanta Idaho, it's beautiful up there. All those spots you should be able to find side roads/spots to get more adventurous... Chris..