Landmark
Not only in the center of town, but close to everything touristy. You can start by the NYPL, NYU, Lord and Taylor, 5th Avenue, etc. They always have something going on that will catch your eye or you may run into someone that will take your breath away.
great place for lunch...
Fashion and Class... enough said! LOVE Bryant Park!
watch movies in the summer
They have a great movie series on Monday nights all summer long. It's crowded but great to go with a group of friends.