Our girls ages 7 and 10 were able to do this tour easily. We had a wonderful time riding around to see the sites and our guide provided interesting details and information. Would definitely do another tour with them.
Totally a leisure ride. Our tour (the city Royals tour) was 4 hours, but you are only biking on flat ground and for about 10-15 minute stints before you stop in front of the next point of interest.