In what has now become a ritual for me, I try to make to time on each trip to rent a bike and then take a ride through Central Park. Usually I will ride for an hour or so and there is nothing like it in the spring. If you can swing it I highly recommend giving it a try. Not only do you get some exercise but you get to see one of the highlights of the city. The ride is fairly easy and you can traverse just about the entire park. Much better than taking a pedicab. Very reasonably priced as well. You can do it for under $20.