"Either way, once in the park you have to go up a very steep hill, and finding the entrance to the pedestrian path on the bridge is tricky the first time you try. Since you're in a park, you're on paths with no names and no signage, so it's hard to figure out where you are." GOogle map shows that there are paths within the park from 218th st to Henry hudson bridge through park.. but are they rideable?