Four of us took the Segway tour of Peninsula State Park and had a great time. Nick was very accommodating when making reservations and our guide Leif was very knowledgeable, having grown up in the area (he even "introduced" us to his family).
The first half hour was for training to make sure everyone was comfortable using the Segway. Although two of us had used a Segway before, the others were able to master it within a few minutes. Our trip lasted about 2 1/2 hours.