The best way to enjoy Manhattan is from Brooklyn. Transmitter Park offers views without the crowds, and you can pick up coffee-to-go and treats from nearby Ovenly. The India St/Greenpoint Ferry is a 5 minute walk and will take you all the way to the Rockaways in the Summertime.
I discovered the Frick my first week in New York, during a heat wave in August. The galleries were surprisingly empty, with only the occasional visitor strolling through the rooms, gently creaking the floorboards. I stood for a while in front of the Bronzino, a portrait of a boy standing against a background of green drapery, and then sat in the courtyard for a long, cool hour.
A landmarked modernist interior designed by Ludwig Mies van der Rohe and Philip Johnson. The former Four Seasons restaurant has been reopened as The Grill. Make your way to The Bar situated at the top of the famous staircase, beneath Richard Lippold’s iconic ceiling sculpture. It is a destination in New York City's architecture and cocktail culture.
For oysters & libations. The comprehensive oyster menu changes depending on what they can get that's fresh. If you know anything about oysters or just plain like them, this is without question the spot. Currently my favorite oyster (not always on their menu) is the Skookum.