The highest rating was for our tour guide, who didn't just drag us along on. Chris was great, and tailored the tour to meet our family's needs. There was a lot to see, and we could not have done this with my dad (who has limited mobility) as a walking tour. If you've ever wanted to see someplace but didn't like making your way through busy streets like a salmon swimming upstream, the Segway gives you enough height and clearance that you can see what you want to see.
Warning...I myself am in good health, but because of an old injury that makes it hard to stand in one place for long periods, by the end of the tour I couldn't wait to sit down as my feet were nearly numb. There were plenty of stops to rest, but make no mistake...it is exercise. :)