The city's Summer Streets program, which will transform seven miles of Manhattan streets (from Centre Street to Lafayette Street to Fourth Avenue to Park Avenue, up to East 72nd) into car-free boulevards for three Saturdays, letting people walk, cycle, dance and much more, start this Saturday at 7 a.m. The streets will be vehicle-free until 1 p.m.

The Department of Transportation has a number of activities planned at certain parts of the route--dance classes, fitness classes from Crunch, seminars about bicycle commuting, musical performances. Transportation Alternatives is also offering group rides to Summer Streets from the Bronx, Brooklyn, and Queens. There are even volunteer opportunities.

Here's a map showing the route and all of the accessible cross streets.