In June we took a road trip to Michigan to see our niece graduate from high school. This was the longest car trip we've ever attempted with kids and it went really well. We had invested in a dual-screen car DVD player which helped a lot. We also broke up the 12 hour trip over two days. On the way out we stopped in Chicago and went to the Field Museum to see Sue (the t-rex) and all the other great exhibits. What a fantastic museum! We loved it. Sue and the story behind her are really amazing.
On the way back we stopped at a beach on Lake Michigan so the boys could play in the sand and water. They loved it!