Get ready to stretch out your legs, New York City. The fourth annual Summer Streets starts tomorrow morning at 7:00 a.m. — the first of three car-free Saturdays on Park Avenue.

Last year’s dumpster pools are gone, replaced with a climbing wall, sand sculptures and New York City sports legends. Sure to remain are crowds of people eager to break out from narrow sidewalks and traffic-clogged streets and use the full width of Park Avenue for walking, biking, rollerblading, playing and relaxing.

The details, including a map of the Park Avenue route and the location of rest stops and activities, can be found on the Department of Transportation’s website.