Don’t worry, you can’t get lost!
So no matter how much exploring you do, it’s pretty hard to get lost while wandering around the island.
However, it is a bit bigger than it looks, and to walk around the entire island on the path is probably about 7 – 8 kilometers – that’s my guess.
You could walk it, it you’re up for some exercise, or you can rent a bicycle, which is a nice leisurely way to circle the island.