Walton County has a great interactive site to show which beaches are public.
https://www.visitsouthwalton.com/beach-bay-access-locations/
Beachside Villas has 2 Beach accesses. The closer access will get you on the beach within 100 yards and you can go to the water line to head over to the public beach. The other access is down San Roy Road and gets you to the public beach. Beachside Villas has a shuttle that runs during the season to take you to the beach!