If you're looking for beach or natural-area access on Amelia Island, Amelia Island State Park sits high on the list for anyone who's spent real time here.
One of the few beaches in Florida where horseback riding is permitted. Located at the southern tip of Amelia Island at Nassau Sound, the park features pristine shoreline, salt marshes, and maritime forest. Kelly Seahorse Ranch offers guided beach rides. Admission is $2 per person via honor box. Also a popular spot for fishing, birding, and nature walks.
Located in Fernandina Beach, it's within a short drive of most parts of Amelia Island.
The venue reads as State Park, Horseback Riding, Fishing, Birding based on its own positioning, which is a useful signal if you're trying to match it against what you're actually in the mood for.
For current hours, menu (or offerings), and anything else that changes season to season, the business's own site at https://www.floridastateparks.org/amelia-island is the source to check; nothing on this page invents a detail that isn't on theirs.
For property owners along the coast, regular home watch visits catch the wear that salt air and beach proximity put on a house before it becomes expensive. The beach is the reason; the maintenance is the reality.