The Bayside Marina boat ramp at Sebastian Inlet State Park provides access to the Indian River Lagoon, Intracoastal Waterway, Sebastian River, and Atlantic Ocean, with ADA-accessible ramp docks and a $4 launch fee.

The marina operates during business hours and offers canoe and kayak rentals, as well as equipment rentals and guided tours for paddlers and anglers.

All three mountain bike trails in the park begin and end at the Bayside Marina, making it a central hub for water-based recreation.