a VirtualTourist member
Mid of January 2011 intend to go Medan(lake toba) with whole family (6 adults and 1 children) worry about transport charges and is there any Minivan transport services can take us around. Went to Bali last week, lots of transport services available and the charges is IRP320,000 from 8am to 7pm-reasonable price.
Yes, you will find cheap prices in Bali because there are loads of tourists using the services.
In North Sumatra there are few tourists so prices will be so much higher.
I have a contact in Medan who would be able to quote a price for you.
His details are here