If you're looking for an anchor beach on Amelia Island, Main Beach Park is the one at the Fletcher Avenue roundabout on the north end of the island's oceanfront strip. The address, 32 North Fletcher Avenue, puts it at the intersection that most visitors think of as the center of Main Beach, and the park is run by the City of Fernandina Beach.
The amenity list is genuinely useful for families and day visitors: a grassy playground, sand volleyball courts, a skate park, picnic pavilions, and lifeguard stands seasonally. Parking is plentiful by Amelia Island standards (which is to say, usually available outside peak summer weekends). Restrooms, outdoor showers, and ADA-accessible beach access ramps are on-site.
The beach itself is the wide, flat north-Florida Atlantic stretch, which means low-angle waves, firm sand on the tide line, and shelling that actually produces finds after storms. Lifeguard presence follows a seasonal schedule (typically late spring through early fall), which is worth checking before planning a day around it.
Dog rules match the city's broader beach rules: leashed dogs are allowed, owners pick up after them, and voice-control-only isn't sufficient inside Fernandina Beach city limits. For families with kids, the combination of beach plus playground plus covered pavilions is the reason this park fills up first on busy weekends.
For current lifeguard schedule, event closures, and any facility changes, the city's parks page at fbfl.us/1086/Parks-Beaches is the source. Phone for the city parks office is (904) 310-3350. Main Beach is a short walk to restaurants and beach-side bars along the roundabout, which makes it the easiest pick for a day-at-the-beach plan that includes lunch without a car move. For dog-specific guidance, the pet-friendly guide covers leash rules and seasonal considerations in more detail.