GEM vehicles are perfect for transporting people, hauling goods within a warehouse, doing work around the yard, and driving short-distances and for in-town travel.
The Red Bug cars and a geocaching kit is a great combination. The little cars make an outing even more fun, and the GPS unit actually works in the car (it's a little tough to connect to the satellites in a regular car). The GPS unit rents for $20/day. If you find 4 of the caches whose waypoints are stored in those units, you can win a T-Shirt!