Walking or biking from Knight’s Key takes about 2.2 miles each way over the old bridge. The passenger train uses a separate mainland depot at the Pigeon Key Visitors Center, 1090 Overseas Highway, near Mile Marker 47; it does not board at the bridge-end parking by Mile Marker 48. Check the current train schedule before setting out and reserve ahead if you’re counting on it. Private boats can tie up at the island dock. Admission is required to access the island and its facilities, including for visitors who arrive on foot or by boat.