I've got a LOT of rounds logged on this one:
It folds up in 3 seconds and fits in the trunk of a midsized, too.
"Jeep" makes a few versions of it, all with cup-holders and some with little speakers built in!
We all throw extra drinks,
cameras, discs, snacks, etc, in the cargo bay underneath and there's usually enough room for a rudimentary diaper bag, too (those field changings are sometimes necessary).
You could check here too:
http://www.dgcoursereview.com/forums/group.php?groupid=369
Whatever you get has got to have big wheels, though. Got to.
Have fun! The adventure is just beginning!