
A roadtrip can be a lot of fun, but lots of people wind up spending a lot more than they expect. The most important thing to do is make a plan and stick to it.
Make hotel reservations in advance and scout out places to eat along the way. When you roll into town without a place to stay, that's when lodging costs can get high, and the same goes for finding a place to eat. There is a lot of fun that can come with being spontaneous on a roadtrip, but the more you plan out what to do and where to be, the less you will wind up spending because the logistics are all settled in advance. Then just follow the plan from one place to the next to save the most.