I highly recommend SegCity Segway tours of Galveston. We live by the rule of doing a Segway tour whenever we visit a city or place for the first time. Segway Galveston is a fitting example. In 2 hours, we covered an area that would've taken over 6 hours to walk. The fact the tour is guided and chalk full of history was the icing on the cake. Our guide was well informed and shared great historical stories of Galveston.
Our only issue is that although we signed up for the Seawall Segway tour, we were mistakenly added to the Tree Carvings Tour, but this turned out to be a happy accident. The Tree Carvings Tour covers all the basics (including a brief seawall cruise by), but it mostly covers the many historical homes and the fabulously carved front yard trees. Our happy accident was made even "happier" when the SegCity management realized their mistake and refunded the difference in price.
By all means, when you go to Galveston Island, make the time to save time by doing a wonderful Segway tour!!