We live in Louisiana, so we wind up taking I-10 east. Once we hit I-75 near Lake City FL, we have a contest about which dwarf will be on the next Disney billlboard, and what color will it be. You'd think that after this many trips, we'd remember the order and colors, but we don't. We we lived in Montana and drove 160 miles just to go shopping for the day, we looked for watertowers and horses. I guess some kids just wouldn't find that interesting. We don't plan on buying a TV/VCR combination. We do like the Harry Potter books on tape. We're up to the 4th one.
We also play a game called Categories that my son played at the lunch table in Kindergarten. Everyone comes up with a category (i.e., favorite Disney movie, favorite place to stay at WDW, favorite ride/park, etc) and take turns answering. We talk a lot in the car to each other.