Swimming at Garden Key Beach is generally safe, with calm, clear waters ideal for snorkeling. The protected moat wall area around Fort Jefferson offers sheltered conditions. However, be aware of strong currents outside the moat area, especially on the Gulf side. Marine life is abundant but typically harmless; watch for sea urchins in shallow areas. There are no lifeguards on duty, so swim at your own risk. The remote location means medical help requires evacuation by boat or seaplane, so exercise appropriate caution.

Dry Tortugas is accessible year-round, with the most pleasant conditions from December through April when temperatures are mild (70-80°F) and humidity is lower. Summer months (June-September) bring heat, humidity, and afternoon thunderstorms, plus hurricane season risks. Spring migration (April-May) offers exceptional birdwatching. Winter provides the calmest seas for boat travel. The park is open daily except Christmas, but ferry schedules may vary seasonally. Book well in advance during peak winter and spring months when visitor demand is highest.

Garden Key is only accessible by boat or seaplane from Key West, approximately 70 miles away. The Yankee Freedom III ferry operates daily departures (weather permitting), taking about 2.5 hours each way with 4-5 hours at the fort. Seaplane charters offer 40-minute flights with flexible tour durations. Private boats are welcome but require navigation experience and proper equipment. There is no parking at Garden Key itself—all parking is in Key West at ferry or seaplane terminals. Reservations are strongly recommended for both transportation options.

Garden Key has no food services, restaurants, or lodging facilities. Visitors must bring all food, water, and supplies needed for their visit. The ferry typically includes breakfast and lunch, plus snorkeling gear. Limited primitive camping is available on Garden Key by advance reservation permit (10 sites maximum), but campers must bring everything including fresh water—no services exist on the island. Most visitors day-trip from Key West. A small visitor center and restrooms are available, but no stores or concessions operate within the park.

Yes, Fort Jefferson is the main attraction at Garden Key and self-guided tours are included with park admission. The massive 19th-century coastal fortress is open for exploration daily during park hours. You can walk the fort's walls, explore historic rooms, and visit a small museum. Rangers offer guided tours and talks throughout the day (schedules vary seasonally). The fort provides fascinating Civil War history and served as a prison for Dr. Samuel Mudd. Exploring the fort complements beach time perfectly, offering shade and historical context to your remote island visit.