Brighton Beach
Brightwater Ave Brooklyn NY (718)946-1350
Lifeguard hours: Mon-Sun 10am-6pm.
Directions: Q to Brighton Beach

Coney Island Beach
Surf Ave at Atlantic Shore Brooklyn NY (718)946-1350
Hours: Daily 10am-6pm
Directions: B, D, F, N, R at Stillwell Ave-Coney Island; D, F at W 8th St
Home to the famous Mermaid Parade (every June) this beach is a "must-see." The Original Nathan's hotdog stand is located just off the boardwalk.

Rockaway Beach and Boardwalk
On Atlantic Ocean, from Beach 1st St., Far Rockaway, to Beach 149th St., Neponsit.  A train to Rockaways.  (718) 318-4000.

Jacob Riis Park
Gateway National Recreation Area Rockaway NY (718)318-4300
Hours: Beach open 24 hours. Lifeguard on duty weekdays 9 a.m. - 6 p.m., weekends 9 a.m. - 7 p.m.
Directions: 2 at Flatbush Ave, then Q35 at the beach.
Parking fees: $4/day
This beach is among the cleaner NYC area beaches and has a topless / clothing-optional area. Facilities are somewhat limited, though there are bathrooms and some vending.