I.B.
It looks like you have gotten a lot of great advice. If you can do it, I agree that leaving around the normal bedtime will help as the kids will go to sleep and you will have a more or less peaceful drive. Yes, unfortunately it will take its toll on you. As a toy i recommend the crayola wonder markers (they only show color on the "magic" paper). THe kids can doodle like crazy and you don't have to worry about messes or stains. We rarely let the kids play with markers so this became a "privelage" for them. I also recommend "play cell phones" for the kids so they can pretend also. Good Luck!