In Indonesia, there is often a not-advertised way of visiting places.
Whether it's about visiting a famous temple, go to a volcano, visit a few local craftsmen, and so on. It's often possible to simply rent a motorbike (scooter) and do it on your own.
Why would I choose to do it on my own rather than do it with a prearranged tour/ride?
Related questions:
Probolinggo to Bromo by motorbike, possible?
Yogyakarta to mount Merapi by scooter, possible?