Hi, I'm planning my epic three-month tour of thirteen national parks out West starting in September. I've got a list of places to visit, and I'm figuring out driving times and how much time to spend in each park, so I'll have approximate dates. But do I have to book accommodation in parks far in advance? The thing I like about a road trip is that while I have a plan, I also have a ton of flexibility. As soon as I book dates, I have a schedule and have to be in certain places at set times. Can't I just wing it?

One thing I think I will book in advance, if it's not too late, is a Grand Canyon rafting trip. I hear this is a trip of a lifetime.