When we go on trips we compile a c.d. to listen to. Then we label it San Diego 2010, or Summer Vacation 2012. Our kids are a little older now so it is fun to get their input that isn't riddled with "The Wiggles" or "Barney" songs.
We are taking the kids at the end of this summer for 2 weeks in Hawaii. We are already talking about what songs to put on the family vacation c.d. Can't wait to roll down the windows and belt out a little Goo Goo Dolls and The Killers...while driving the coastline in a swimsuit with my family.
I make up bags of snacks and keep them in the front seat. Every hour I pitch a baggie to each of the kids. We love doing Mad Libs also.
Play the "lets tell a story game." It will be fun and adventurous with your little ones. My hubby or I start making up a story for about a minute..then when it gets to a potentially good part you pass it on to the next person. Then they develop the story even more...then pass it on to another person. Ours usually end with someone getting eaten by a shark or falling in a volcano...and poop and farts enter the plot somehow every time!
Enjoy the road trip!!