First, of the fact that they don't allow children under age 16. This put my family in the uncomfortable position of having to leave our 6'0", 15 year old son at the hotel while we went on the tour. Also, beware of the price. I understand that the segways are a novelty, but for four people, it was $280, and the tour doesn't even show you the monuments! Learning about the history of the Smithsonians is less fun than simply riding the segways. Our guide was pretty knowledgeable, and it was a unique experience, but for the price I definitely expected a lot more.