Matteo R.
Yelp
For being nice, clean, friendly, easy to get to, and free, Jacob Riis is perhaps my favorite beach in the proximity of NYC. Ride the 2/5 train all the way to Flatbush, then board the Q35 bus on Avenue H and Flatbush, and twenty minutes later you're on the beach. I'll be the first to admit the the ride along Flatbush is not the most scenic one, but things get better/greener as soon as you reach Marine Park and Floyd Bennett Field.
Instead of ugly buildings and a freeway, Jacob Riis beach has the beautiful 1932 Art Deco bathhouse with its iconic twin octagonal brick towers as a backdrop[1].
The beach is large, clean, and well kept. There are bathrooms at either end of the beach,plenty of trash cans along the boardwalk, and a couple of places where you can grab a bite and something to drink. Because the beach is very wide, it never gets as crowded as at other beaches.
It gets busy, though, but the overall atmosphere is pretty relaxed here: I've seen people drinking beer, smoking, and topless women; all in front of the oblivious life guards. The gay-friendly part of the beach is the one further East, past the last lifeguard.
Oh, and if you're a smoker: please take the cigarette butts with you. I've seen quite a few people smoking here, and every single one of them left the cigarette butts on the beach. That's not cool; the beach is public; it belongs to everybody, and we are all guests here. Would you leave your cigarette butts on the floor at a friend's house?
Tip: on the way back, walk a few blocks East and board the Q35 bus on Rockaway Beach Boulevard at Beach 149th St. That way you will avoid the crowds waiting for the bus at Jacob Riis Park Roadway.
Also, if you love this beach, did you know that bill HR 2606 would give Secretary of Interior authorization to build a gas pipeline through Gateway National Park, under Jacob Riis beach, and a few miles out in the ocean right in front of the beach? That's right: the use of national park land to provide gas to the city and realty business to industry. And all this without input from the public. If you believe that the National Park Service was created to protect parks and not to promote the creation of industrial parks; if you want to protect Gateway national Park and Jacob Riis Park, you can sign a petition here: http://signon.org/sign/no-pipeline-in-gateway
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[1] An interesting article about the bathhouse. And the renovations that started in the 1990s and were never finished: http://www.nytimes.com/2012/08/22/nyregion/jacob-riis-bathhouse-envisioned-as-park-centerpiece-looks-abandoned.html