Somethings just hit me instantaneously when looking around and this was one of them! During an oceanfront picnic out of the corner of my eye I spotted the sign that spurred the creative (OK, silly) photo at hand.
You can find this ‘Slow No Wake’ sign just past the Stock Island Marina Village. Go to Mile Marker 5.0 oceanside turning at Burger King onto 5th Street, down 5 blocks taking a left on 5th Avenue, down 1 block to Shrimp Road and turn right. Once on Shrimp Road drive down a half mile down on your left just past the Stock Island Marina Village and keep driving till the map turns blue.