Last year we had an awesome trip making our way round with the car. We enjoyed boarding lots of different places with the only thing really keeping us in one area was were we had our accommodation booked (staying Tomamu, Asahikawa, Otaru, Niseko)
This trip I was thinking it would be nice to free style it-- ie not book accommodation until there. With the thougtht being we could follow the weather pattern more. I don't think this would be a problem for most places as they seemed pretty quiet with lots of accommodation options -- was but was nervous that Niseko/Kutchan way may get booked