Take the N or the R train (both on the Broadway Local line) to 59th Street and Fifth Avenue. Approach the park from the south entrance located at 59th Street and Sixth Avenue.
Look for a statue of Simon Bolivar riding a horse. Walk down the flight of stairs to the left of the statue. At the bottom of the stairs you'll be facing the pond. Turn left and walk 20 yards. You will see the The Pond waterfall directly on your right.
Take the number 4 (on the Lexington Avenue Express line) or the number 6 train (on the Lexington Avenue Local line) to 103rd Street and Lexington Avenue. Walk south to 102nd Street, and turn right to go west to Central Park. You will cross Park Avenue and Madison Avenue and see Central Park at Fifth Avenue.
Enter the park using the 102nd Street entrance and follow the trail until you reach the East Drive. Turn right and follow the East Drive for about three blocks until you reach the ravine. Look for The Lochs waterfall at the bottom of the ravine.