Little twisty road to avoid tha bland highway briefly
Its a long way to ship your bike, but 150cc ones can be rented there. I got my GL 1800 there and mine the most powerful wheels virtually in all Indonesia. Riding the circumference of Bali was some of the finest riding of my million-kilometer life. Pushed the envelope in mountainous twisties almost daily and scraped pegs frequently. Lots of traffic dodging, chickens goats and lumbering trucks. But as good as twisty riding gets on pavement. Perfect sea shore with everything from surfing to scuba to fishing and $10 - $500 hotels, great food, people. $50 a day is living in luxury including gas. If you can get there, put it on your bucket list, DO RIDE INDONESIA. See my blog on details.
Start from Salatiga through scenic roads to Kopeng, then up to the peak of breathtaking mt Telomoyo. Road surface poor near the peak but still passable even on scooter
Ride between rubber trees
Ride between two volcanoes in Central Java. Depart really early in the morning (4:30am) to see the sunrise. Amazing sceneries