The tiny island between San Francisco and the East Bay, Treasure Island is home to Treasure Island Yacht Club, Treasure Island Sailing Center, Golden Gate Rugby, the San Francisco Boys and Girls Club, Kidango Child Development Center, and the California Netball Association.
The Great Lawn is a terrific place for kids to fly kites - with breathtaking views of the city.
Clipper Cove Beach is a secluded beach located off of the Causeway. Parents can pack a picnic beach and hang out for an easy afternoon with the kids.
Tennis Courts are located on California Avenue and are open to the public.
A pedestrian path extends from the main street lining the shore and begins at 9th street, where there's also a small playground. You can walk or bike this short path - the asphalt path is too rough for skates or scooters.
Treasure Island is owned by the San Francisco Recreation and Park Department.
108-Treasure Island bus. This is a 24-hour direct route (with Owl service from 11 PM - 5 AM). The pickup/dropoff point for the 108 in San Francisco is at the Transbay Terminal at 1st and Fremont), and the bus makes several stop on the island.
More info on the 108 bus: http://www.sfmta.com/cms/asystem/routedesc.php?rted=108
Take the Bay Bridge, merge into the left lane. The exit to Treasure Island is about three miles from San Francisco. You can drive straight into Treasure Island and easily find parking at one of the many lots there.