The Hudson River Waterfront Walkway starts at Exchange Place in Jersey City and travels north to the George Washington Bridge in about 10.5 linear miles. All along the waterway are artifacts from the waterfront's past as a hub of intermodal transport and oddities of its new role as a financial center and high-end residential living. The HRWW is the easternmost section of the Liberty Water Gap trail, which eventually will create a hike and bike friendly path across New Jersey.
This is a great series to do on a bike. If you do not have one, you can rent a CitiBike near the Exchange Place PATH station near the southern end of the series or the Newport PATH station at the northern end.
If you want to slice time off your trip around the HRWW, take this cut-through by walking diagonally across the cul-de-sac instead of the long way around. GPS signals triangulate wildly here so do not be shy about using the hint below