Hey guys, my friend and I are planning to do this trip in late May before I start work. We depart from our hometown of Milwaukee and spend 2-3 days in Yellowstone, camping for one of those nights. We then take out for Champaign where we will spend a night at a friend's house. From there we head back home. We both have little experience with trips more than 500miles so any advice you guys have regarding attractions along the way or ways to save some money is welcomed. Most of our questions are pretty simple: Where can I get a shower without renting a hotel room? Is it common to just sleep in the car or am I better off finding a motel (I have very little money after budgeting for gas)? Any must-see attractions at Yellowstone or on the way (not just some old house or a graveyard)? I've always wanted to raft/swim in the Mississippi River, what's the best way to do that?
Really, ANY advice you guys can offer would be appreciated as I know little about roadtripping and even less about the route (that is part of the reason we are going).