This is a pro tip, but also a summer tip, take the ferry from Lower Manhattan to Rockaway and spent the day. The beach is great and the area is impossible to gasp that it's 30 min from Manhattan (without traffic) - Eat as many tacos you can, cause it's the best in the state of New York!
This simple Manhattan salt house is shaped like a monumental grain of salt. The Shed is an effort by the city to make even their most utilitarian architecture into unique pieces of art.
This quaint shop boasts an artfully arranged and tastefully curated selection of jewelry, pottery, books and art. I have to keep myself from going there too often, because I have trouble leaving without making a purchase.