Are there any forums/websites where I can plan a cheap roadtrip?

My mother asked me to plan a roadtrip under a budget. (Gas is not part of this budget, thankfully.) We live in Los Angeles and would like to go to either Arizona or Oregon. I just would like to be able to plan out hotels/motels to stay and vegetarian friendly restaurants that aren't super expensive. And what sites to see in either places that are good money wise and picture/activity wise. Thanks. :)