A Jacksonville-area seafood institution in Mayport — the working fishing village at the mouth of the St. Johns River where the Navy’s Mayport Naval Station and the last functioning ferry crossing on Florida’s northeastern coast create a genuinely distinctive waterfront character — Singleton’s Seafood Shack delivers fresh shrimp, oysters, and Gulf Coast seafood from the fishing boats that work the surrounding waters. Cash only, picnic tables, and the most authentic seafood shack experience in the Jacksonville area.