Well, riverotter, it all depends. Are you looking to go for a ride in the Gulf or the Bay? There are several places north of 98 to put your 23' boat into the Bay. The most public access close to Grayton would be north of hwy 98 on hwy 393. There is a public boat landing about 1.5 miles north of 98, on the left side of the road, just before you cross the bayou. If you are looking to dip into the Gulf, the closest place is Grayton Beach, but you must be a property owner in Walton County, own and use a four wheel drive, purchase a beach permit for launching.
Smiling JOe