There are over 400km of paved road on Saaremaa and many more dirt roads. Hitching is not uncommon on the main routes (but there's not much traffic on minor roads). Buses do get around the island, but not very frequently. It's possible to put a bike or two in the baggage compartments, though you have to ask the driver for permission. Before you head out, call the friendly folks at Kuressaare bus station (453 1661) for help in route planning.