On Fridays, Governors Island visitors can use children and adult bikes for one hour for free from 10 AM to 3:30 PM, with the last returns at 4:30 PM. However, the tandem and quadracycles cost the regulr rte (from $30 per half hour to $45 for all day depending on the bike). Helmets are included with all rentals. About five miles of paths are available for biking on Governors Island, including the promenade that almost completely circles the island except for the main ferry docks and the Water Taxi Beach. Visitors are also allowed to bring their own bikes. Captured with an Apple iPhone 4, the picture above shows a view of Lower Manhattan skyline.