After being awestruck by walking over the George Washington Bridge (CAUTION: watch out for cyclist that share the road with pedestrians!), you will be wondering which way to go. That's perfectly normal.
Follow the pedestrian walkway which will breifely loop around and back in the same direction so that you will get out of the clover leaf and land on a 178th St. You may continue on 178th St to Mt. Washington Ave. Ignore going one block further to 177th St. (that might be there for cyclist using a one way street.) Turn left at Fort Washington Ave.