My 10 year old daughter and I rented the bikes for 24 hours. The rates are much cheaper than the CityBikes and much better bikes. They fit the bikes to you, come with travel pouch and lock. We took them to the USS Constitution (they clerk told us how to go across the locks, which was cool and less crowded than Freedom trail). They will let you keep them wherever you are staying, but since we stayed close, we left them there overnight. They next day we rode to the Children's Museum and The Tea Party Experience. Easy place to bike and a lot of bike lanes.