The 55 mile course started at Central Park and went all the way down Manhattan to the Brooklyn Bridge. From there to Prospect Park, and then out to the waterside, opposite Staten Island.
At Canarsie Park (second rest stop) the 55 mile route split from the 75/100 routes and cut over to Astoria before doing a hop back into Manhattan and the finish.
Next year I think I'll go for the 75 or 100 as when I split from the rest of the riders to do the shorter route I was a bit ahead of the 55 mile group and ended up navigating quite a lot of the course with just one other rider.
I was pretty impressed with the directions - although I was certain I'd get lost it was pretty easy to follow the arrows spray painted on the road.