The National Park Service operates a small campsite on the Ofu unit, placed directly behind the beach near the To'aga archaeological site. Facilities are basic: open-sided fales (traditional Samoan structures with a roof but no walls), a composting toilet, and running water. There is no electricity, no camp store, and no ranger station staffed around the clock. You'll need to bring everything — food, cooking gear, snorkel equipment, insect repellent — from Pago Pago, as there is almost nothing available to buy on Ofu.
The trade-off for the basic conditions is position. You are sleeping next to one of the most pristine beaches and healthiest reefs in the US Pacific, with no other tourists in sight. Nights are quiet except for the reef. Book well in advance through Recreation.gov and confirm with the park before your flight — availability is limited and the campsite can close for weather or maintenance. The NPS also has basic visitor information available through their Ofu unit contacts, and staff can advise on reef conditions and trail status.