The view from Top of the Mark is one of the best in the city. On a clear night, it is truly breathtaking. This bar is a lovely place for a drink after a nice dinner. Top of the Mark has some of the best martinis ever and a very extensive martini list at that. I think there are 101 varieties. All of the drinks I've had here are just excellent though at the price, they should be.
If you want to splurge for brunch, they have an excellent one on Sunday that I would highly recommend. I was there for Easter awhile back and it was truly outstanding.