United States
Yes, there are excellent beaches not far from the city and I don't mean the Hamptons. July/August is very hot and following the locals is a good idea. Long Beach is a pretty town by the sea with a long boardwalk, good swimming and surfing (non-residents pay $6 entry), and Jones Beach State Park ($8 parks entry fee) has 6 miles of seafront, 2 bathhouses and tons of amenities (but bring your own food).
Both feature white dune sand, blazing sun (remember the sunblock!) and safe swimming with lifeguards during the summer.
Long Beach: Catch the Long Island Rail Road (LIRR) from Penn Station to Long Beach, then walk to boardwalk;
Jones Beach: Catch the LIRR (Babylon branch) to Freeport, a special bus service, or drive
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