Webster Hall is a solid venue, and a frequent stop for many great bands on their rise to glory. If you've only got a few nights in the city, chances are a great act will be playing here.
My second-favorite outdoor-place in Manhattan. The abandoned 1.6 km rail tracks running above Chelsea down to the Meatpacking district were turned into an above-ground park. Perfectly nice place for sitting in the sun, reading, relaxing, having lunch in some green spot in the city. Nice views at the Hudson River, New Jersey, the Statue of Liberty (little small from there but still visible) and the architecture around Chelsea.
A new artificial island park where all New Yorkers and visitors can experience nature and art in a unique urban oasis on the Hudson River. The park features a lush, seasonal, landscape with rolling hills, winding pathways and dazzling views coupled with programming that includes music, dance, theater, poetry, comedy and arts workshops for all ages.