Got in on a Groupon for a half-price, two-hour. ride on a Segway. Groupon is expired now, was $30 each.
http://rockytopglide.com/
Wifey and I took the ride this morning and had a great time.
They give you a dorky looking, good, half-helmet and twenty minutes instruction then lead you all over LoDo and down to Coors Field and numerous parks in Denver...about six or seven miles. We were lucky as we were the only ones signed up for this morning run so it was just us and the instructor/guide.
The first couple blocks on this $6K machine were a little tentative, but after that you learn to relax. It's different than anything you've ever done and there is nothing really 'natural' about it, but it comes quickly.
You go forward and back with forward or back weight shift on your feet. They actually will back up. The T-handle steering bar doesn't really turn like a scooter, you lean the bar in the direction you want to go. It can actually spin about in place when stopped if you're so inclined or just want to show off. They go up and down ramps effortlessly, stairs not recommended.
They'll go 13 MPH and can accelerate quite briskly if you want to. They stop quickly if you really rear back on it. When you are stopped without dismounting you kind of 'hover' in place.
It was really enjoyable, if you get a chance try it out.