My bf and I decided to rent bikes to ride around the islands after walking around for about an hour and half. On a Saturday morning they opened at about 10am. We were there well before 10am and walked around and ventured to the various parts of Centre Island. Once the shop opened up we each rented our own bikes. We wanted to try the tandem bikes but didn't know if we could manage it so we went the safe route haha. They do accept U.S. dollars too. No credit card though. So have cash on hand. We rented the bikes for just an hour (the minimum) and got around the island a lot faster and it was enjoyable! There are no bike locks. I believe you can request for a helmet if you want one. We didn't wear helmets. As long as you know the basics of safe bicycle riding, you should be fine.