Most beach towns give you one piece of water to ride on. Fort Walton Beach gives you three, and the choice between them decides what kind of hour you are buying.
To the west and directly in front of the town is Santa Rosa Sound, a long narrow channel between the mainland and Santa Rosa Island. It is shallow, protected from swell on both sides, and flat in almost any weather. To the east is Choctawhatchee Bay, roughly 135 square miles of open brackish water that builds a short steep chop the moment an afternoon breeze arrives. And a few hundred yards south over the dunes is the Gulf, which on a calm morning is glass and on any other day has swell running onto a shallow sand shelf.
You can ride all three in one session. The sound and the bay are connected around Okaloosa Island, and the pass at Destin links both to the Gulf. That is an unusual amount of variety for a rental hour, and it is the reason the guided tour format has taken over here: rather than an hour of loops off a beach, most operators run led trips of ninety minutes or more that actually cross water and end up somewhere, usually the sandbar at Crab Island.
There is a complication specific to this town that nobody puts in the brochure. Eglin Air Force Base occupies an enormous stretch of land immediately north and west of Fort Walton Beach, and in recent years the base has tightened access to a set of shoreline waterways, including stretches of Santa Rosa Sound, requiring a permit for boaters and paddlers who want to be there at all. Enforcement is by base security rather than by a beach attendant. Any reputable livery will brief you on where the line is. Ask anyway, especially if you are heading west.
The rest of the watersports menu here is the standard Gulf spread, with one local characteristic: because the sound is so consistently flat, paddleboarding and towed inflatables work on days when the Gulf side has closed its water under a red flag. Look across the island before you cancel anything.
Finally, the honest note. A personal watercraft is not a fairground ride. You are the operator of a vessel under Florida law, the responsibility is personal, and the shallow, grassy, marker-poor water behind this island is unforgiving of a rider who has stopped paying attention. The rules section below is the most useful part of this page.