The pleasant vibe on the island makes it very easy to kick back and absorb the atmosphere, read a book, work on the suntan, do some life planning, take a nap and there is Yoga available at several places so you can recharge you body and mind.
Enjoy the quiet beaches, take out a kayak, try stand up paddle boarding, go fishing, watch the surfers from the boardwalk or just feel the soft sand under your feet.
For a different view of the island go for a horse ride.