Hire a bike from the ferry terminal and cycle around the island - this is a very comfortable and individual way, along with all the other individual cyclists. A full loop of the island is around 25km, so is an ideal cycling distance. Bike hire is around $30 per day.
Cars are not permitted, but there is also a regular bus shuttle available for traveling around the island. A day ticket allows you to stop everywhere you want. If you have enough time, make a complete trip around the island first in the morning, and then decide where you really want to stay for a few hours.