Garden Key Beach Trail

This is less a hike and more a wander — a half-mile loop around the sandy shoreline of Garden Key, the tiny island dominated by the massive hexagonal Fort Jefferson. You step off the ferry dock and within seconds your feet hit white coral sand so bright it hurts to look at without sunglasses. The water is absurdly clear — that shallow, electric turquoise you associate with screen savers, except it's real and it's everywhere. You'll circle past the fort's towering brick walls on one side and the open Gulf of Mexico on the other, with nurse sharks sometimes cruising the shallows close enough to startle you. There's zero shade, zero elevation change, and zero chance of getting lost. This is the trail for anyone who traveled seventy miles by boat to reach the most remote national park in the lower 48 and wants to soak in every angle of it.