Two of us are driving from Baltimore to Austin on July 1st. We have plenty of time for the trip (the voyage IS the destination) and want to have some fun en route. We're young, outdoorsy, water-friendly people - athletic, music & festival loving, and very intellectually curious. Any tips on events, sites, or beautiful locations that we shouldn't miss? Please include any culturally interesting historic sites (we're getting our phd's in education & personal experience often provides the best teaching tools).