We went to Maui on our honeymoon. You're going to love it! We didn't rent any bikes during our stay, but the place to rent them from is this. http://www.bigkahunarentals.com/ I recommend taking the Road to Hana, and checking out the black sand beach, along the route. http://www.govisithawaii.com/2008/03/19/tips-for-driving-the-road-to-hana/