Road Trip!

My wonderful best friend/sister-in-law Missy is going to Washington state for her cousin's wedding and invited me to join her. I'm very much in need of a change of scenery so I'm really excited. The only problem is that we're taking our little ones without our husbands. Her husband, Brad, just started two new jobs and Brian has to work. It's going to be me, Ethan(6 months), Missy and Abbi(10 1/2 months). We're driving there all day Thursday and we'll be driving home all day next Tuesday. The only thing I'm a little nervous for is the drive with Ethan. He's usually really good in the car but the longest he's been in the car is just over an hour. We'll be in the car for at least 11 hours. Any suggestions on how to keep him happy? I am very excited to have a girl's trip with Miss because its much needed I think for both of us. And I'm really excited to see her family. I grew up with Missy and her cousins would come to Utah every summer and I would spend a lot of time with them. Its going to be super fun to see them again. I'll take lots of pictures because I hear that Washington is absolutely beautiful. Please let me know if you have any ideas on how to keep Ethan occupied.