I plan to go Hokkaido with my mum next year may.
Do I really need to rent a car to travel around hokkaido?
Is washroom available everywhere? My mum need to used washroom frequently.
Do we need to prepare small coin for using washroom? Malaysia public washroom cost 30cent

If I plan to travel for 7 days in Hokaido, is RM10K enought for 2 persons (exclude air ticket)?

Thanks