There is a HD Kawasaki Yamaha dealership on Maui. It's called cycle city. http://www.cyclecitymaui.com/ Prolly your best bet at renting a sportsbike on Maui. Most others are scooters, HD, and I wanna say t-rex's, cept them are dumbed down tourist versions. On Oahu there are loads of sport bike rental places. But not really worth it IMO. Oahu has too many fucking people and nothing but congested highways, at all hours of the day. Can't really give you a price range cuz I didn't look. I saw alot of Busa's and ZX-14's. Bout the only cool roads on Oahu are on the North Shore. 83, 72, 61 (highway), 63 (highway). Granted they don't really call them by the numbers, but by the names. Make sure to eat at Mackies shrimp in North Shore.