(I made a Flip movie of this trip, but it was too big to post and I can’t figure out how to make it smaller.)
The Harlem Loop starts from my apartment (the red “X”) and goes north up 2nd Avenue. The bike path going north along the East River is closed between 34th and 58th Streets, so I just take 2nd Ave up until I hit the river at 58th St.
Very good bike path from here heading up the River to Harlem. When the bike path on the river ends at 120th St, you head east through Harlem toward the Hudson River. It gets weird here at one place with traffic, but once you hit the Hudson, the path is gorgeous.
Head south down the Hudson, past the Marina, the Upper West Side, Midtown, til you get to Greenwich Village. There, you head east on 10th Street til you get back to the apartment.