Directions to Mercy High School (from Mt. Sinai and Port Jefferson):
 

From LIE  last exit 72 to Orient Point.
Roanoke Ave. to Rte. 58 traffic circle. Take the 2nd exit on to Cr. 58 and continue to Ostrander Ave (Hess gas station on corner).
Left turn on to Ostrander Ave. to Middle Rd.