Turtle Island, also known as Guishan Island, is a volcanic island off the coast of Yilan, Taiwan, renowned for its unique turtle-like shape and rich ecological diversity. Visits are typically possible from March to November, with boat tours departing from nearby harbors. Due to the island's protected status, independent exploration is restricted, and guided tours are mandatory to access certain areas, including the military tunnel and the main temple. Accessibility can be limited for individuals with mobility issues due to the boat transfer and walking involved on the island. A typical visit lasts around 3-4 hours, and the cost for a tour package, including boat transportation and guide services, ranges from approximately NT$800 to NT$1500. Solo travelers can easily join group tours. Expect to see diverse marine life during the boat ride and explore volcanic landscapes and historical sites on the island.