I think this is a good idea. Mayor Bloomberg has set apart three Saturdays in August, the 9th, 16th, and the 23rd, for recreational purposes. I missed today’s opportunity but I think I will go next Saturday or the following one. There are a bunch of activities that you could do including biking, running, yoga, or dancing. The city closed off Park Ave from Central Park down to Brooklyn Bridge from 7am to 1pm. Take advantage of these car-free weekends!