Last week City Parks Commissioner Adrian Benepe cut the ribbon on a short stretch of waterfront greenway connecting 83rd and 91st Streets. The path is the final link in a pedestrian path stretching 12 miles from Battery Park to Dyckman Street. The long-awaited extension eliminates the need to take a half-mile detour through Riverside Park that has for years confounded strollers, rollerbladers, skaters, runners and bikers making their way along the river. Mayor Bloomberg was among those credited with bringing the uninterrupted greenway to completion by allocating funds for most of the nearly $16 million project.