Great info here. I'll probably participate in the 5 borough tour, but I want to have ridden in the city at least once before hand.

I have the same question Mrvile has. I'll be taking the north/south country trailway down to Yonkers. can I just hop on broadway to central park? I just want to ride around Manhattan and I'll take the metro north back home as long as bikes are allowed in grand central off peak.