It_s got a lovely view of lower Manhattan, and there are many benches line the promenade. You can get there pretty easily by taking the R train to Court Street. Get off on the side that says _Montague Street_ and take the elevator to the street.
Walk along Montague Street AWAY from Court Street (Court Street is the busy street that is perpendicular to Montague.) Montegue Street dead ends into the Promenade after 5 blocks or so.
The view is just breathtaking!
Good Luck
To see a panorama skyline you have to get away from the island, like on a ferry. Go to the Statue of Liberty perhaps.
Or go to NJ.
Otherwise, look up and there_s the skyline all over the city