Most beach towns have a military base somewhere nearby. Fort Walton Beach is the other way round: the base has a beach town attached to it. Eglin Air Force Base occupies roughly 464,000 acres — about 724 square miles — spread across Okaloosa, Santa Rosa and Walton counties, which makes it the largest installation the United States Air Force operates anywhere by land area. It also controls a block of over-water test airspace in the Gulf measured in six figures of square miles. Everything north and west of the city limits, all the pine forest you drive through to get here from Interstate 10, is range.
Nine miles down the coast at Mary Esther, Hurlburt Field runs a different business on about 6,700 acres. It is the headquarters of Air Force Special Operations Command, activated on 22 May 1990, and the home of the 1st Special Operations Wing and the USAF Special Operations School. Gunships, tilt-rotors and low-level transport aircraft fly out of it. If you are on the beach on Okaloosa Island and something large, dark and unusually quiet crosses the shoreline at low altitude toward the west, that is where it is going.
This shapes the town more than the water does. Fort Walton Beach had around nine and a half thousand residents in the mid-1950s and has hovered near twenty thousand since 1990, and the difference between those numbers and the size of the commercial strip is made up by the base payroll. The result is a beach destination that also has a Tuesday economy: a town that empties less in September than its neighbours, that fills its restaurants with people on a duty schedule rather than a vacation one, and that has a change-of-station season in summer as well as a snowbird season in winter.
For a visitor, the practical news is good. The single best thing to do on this list is free and does not require you to pass a gate. The Air Force Armament Museum sits on Highway 85 outside the Eglin main gate, charges nothing to enter or park, and holds a collection of aircraft and air-delivered weapons that would be a paid headline attraction almost anywhere else. Beyond it, roughly a quarter of a million acres of the Eglin reservation is conditionally open to the public for hiking, paddling, fishing and camping under a permit that costs a fraction of a theme-park ticket.
Two honesty notes before you plan. Access to the bases themselves is a separate matter from access to the museum, and it is controlled by current Department of Defense policy rather than by anything a travel page can promise. And the reservation is a live test range: sections close daily for training, the closures are published rather than negotiable, and turning up without checking is how a good day out becomes a locked gate.