I travelled that route (and back) with my parents a couple of times around the same time, as tourists.
I think I was 13 the first time, and 15 the second time. Although we had a mobile phone, we didn't phone ahead, we simply turned up somewhere. Perhaps once we had to drive further than we wanted (until midnight or so), and a couple of times I think the cost was a little higher than we wanted, but considering this was a family of 5 it worked out nicely.
My parents found some interesting places, too. I've not met anyone else that's been to see the Mitchell Corn Palace. (I've only met a few Americans who've seen as much of their own country as I have, which is a pity.)
I think I was 13 the first time, and 15 the second time. Although we had a mobile phone, we didn't phone ahead, we simply turned up somewhere. Perhaps once we had to drive further than we wanted (until midnight or so), and a couple of times I think the cost was a little higher than we wanted, but considering this was a family of 5 it worked out nicely.
My parents found some interesting places, too. I've not met anyone else that's been to see the Mitchell Corn Palace. (I've only met a few Americans who've seen as much of their own country as I have, which is a pity.)