It's an easy three block walk from the Fleetwood Metro-North train station (30 mins ride from Grand Central). Cross the street from the station and take the flight of stairs to the left of the Time Warner Cable office. You'll pass Milestone School. Keep walking uphill as you emerge on W. Broad St. You'll pass a gas station (on your right), a Metro Fresh Supermarket, and then a parking garage. Next you'll come to Gramatan Ave. Go left onto Gramatan and the Bayou is on your left just after the Bank of America.
10 mins from Pelham. The most direct route from Pelham is to take Lincoln Ave west and keep following it until you come to a rotary with a statue in the middle. Stay right to go onto Gramatan Ave and then just keep straight. You'll see the Bayou on your left after 4-5 lights. There is street parking on both sides of Gramatan Ave., and there is also a municipal parking garage right around the corner on Broad St. between Gramatan Ave and Fleetwood Ave (it's across from the Riverside Memorial Chapel).
A local cab service called Xpress Taxi is close to the Bayou: 914-667-1111.