I'm planning a big summer road trip. I'm saving up as much money as possible, and I have zero debt. Besides camping, food, hostels and gas, what other expenses should I worry about? What about health/car insurance? I've got AAA, a cell phone, friends to split gas. Should I carry all my cash with me? Use an ATM? I'm not worried about where to go or what to do, I don't want to cut a trip short for silly reasons!