When my son was slightly older than your son I took him to Florida for a week with the intention of Scallop Hunting.
A bad storm a day before we arrived shut down our plans , so we rented a Hummer and toured South Florida wave bashing every beach we could find.
He is mid 20's now and still talks about that Guys only trip.
Found some deserted beach and taught him how to drive the Hummer.
https://www.riverventures.com/blog/2...catch-scallops
Combo tours let you scallop hunt and swim with Manatees