nothing official or legal, you'll be trespassing on someone's land and they are getting stricter all the time. Also most of the golf courses are surrounded by kiawe trees so watch for thorns.
The only bright spot would be out at Kapalua resort where they are developing an extensive trail network. Although designated bike trails are planned, my understanding is that only hiking trails have been completed and opened so far. It is worth a call to express your interest in riding there.