The main reason to come to Ofu is the reef. The National Park of American Samoa's Ofu unit protects about 400 acres of offshore waters along the island's southern coast, and the coral coverage here is extraordinary — scientists have studied it for decades because the reef has proven unusually resilient to bleaching events. Snorkeling in the To'aga lagoon is one of the best non-diving reef experiences in the US Pacific. The water is clear, the coral is dense, and the fish life is diverse and largely undisturbed. Pack your own mask and fins from Pago Pago. Nothing is available to rent on Ofu.
The beach itself runs for nearly two miles of white coral sand, framed by forest and mountains, with the reef just offshore. On most days you'll share it with almost nobody. There's a local belief that the forest between the road and the beach is home to aitu — spirits — which may partly explain why even locals tend to leave the shoreline alone. Whether or not you believe in spirits, the solitude is real and it's the thing you'll remember most.
Inland, the Tumu Mountain Trail climbs sharply from the western end of the island to the ridge above, giving views down over both Ofu and Olosega, the reef, and on clear days the distant silhouette of Ta'u. The hike is hard — steep, humid, and in places you'll need the fixed rope — but the ridge views are the payoff. Start early to avoid the heat and allow three to four hours. Check first whether the trail is open; it closes on Sundays out of respect for the local Sabbath.
A short walk across the bridge to Olosega adds another dimension to the visit. Olosega's village is quieter and less visited than anything on Ofu, and walking through it gives you a sense of daily life in the Manu'a Islands. The bridge itself is a landmark — a single-lane span across the shallow Asaga Strait, with the reef visible below through the clear water.