Take Interstate 10 to Exit 50 in Mississippi.
Exit 50 exits to Washington St/609, go south, you'll cross a drawbridge, not long after is Hwy 90/Bienville Blvd.
Turn right/west on Hwy 90. Follow it till it ends at the bridge repair. There will be a stop sign and you have no choice but to turn left and dogleg onto a frontage road which is Porter Ave. There is an abandoned convenience store at the intersection.
Turn immediately right, or back to the west, onto Porter. It will meet the beach and make a hard 90' left turn. Right in that bend, next the bridge repair, is a small trailer with some boats around it. That is the temporary OSYC 'clubhouse'