Traveling with kids

So as you all know we are moving to Florida and leaving on August 26th. We are going to PA for the weekend and then Sunday night we are going to be leaving around 11pm. Tim's gonna drive thru the night, we plan on stopping for breakfast, then go to a park and then do lunch and then back in the car for nap time. Drive until dinner, have dinner and get a hotel with a swimming pool and try to tire the kids out and then repeat and we should be in Florida on Tuesday. We have the ds, leapster, portable dvd players, books, activity books, and a few toys for in the car. What are some great ideas you've come up with. Traveling for such a long distance with 3 small kids we'll take any ideas possible!!!