Road Trip Snack Boxes for Kids - I made these for this summer's trip and it was a huge hit. I found the boxes in the craft section at Wal-Mart and included a variety of salty and sweet treats. Then on each leg of our trip (divided up into 1-2 hour increments), they could choose one or two things to eat. Very convenient on us as parents and the kids love it, too.
My Busy Kit - ideas for activities include foam sticker (lots of stars), crayons, notebook, stickers, coloring book, magnetic drawing pad, color matching with paint strips (need to make this), some number game, small book of choice, pompom game, playdough with straws to stick in it