Two couples traveling over July 4 for a 7 day trip. We're from Philadelphia, but we don't need to start there! We'd fly to a good starting point, then drive. We're looking for lots of campy things--thought of touring Route 66, but would love to start at Graceland and head to Vegas! Definitely want stops like 'the best apple pie' or maybe a music festival (blues in Memphis?), or some crazy attractions along the way (a wigwam hotel?) and other fun stuff. What's the best way to go? What should we be sure to see?