Mystery Island

Here's an island trivia question: What island is visited by hundreds of people every day, but very few of them know they are on it?

Over the years I've been on this island about 30 times, and each time I dearly wanted to see more of it. But a wall with a locked gate, and a security camera, discouraged me from trying. The photo below is a hint to what island I am talking about. Over the next week we'll get through that locked gate to wander around this little island.