Another trip I'd like to take with the kids? A train trip.
Several years ago, I did a train trip from Austin to Chicago, for a wedding. I vividly remember this trip, because my sister had a baby while we were on the train!
Anyhow- with my kids, I'd love to do this trip (or something similar).
Kiddo loves trains, and plays them almost daily! He doesn't watch too much on TV with regard to trains, but it is definitely one of his favorite toys currently. Thanks to his cousins, there are a ton to play with! We even got some on a recent visit to IKEA...