We are a family of four with 1 young child. We will be arriving Okayama airport and planning to hire a car to tour around Shikoku. Our itinerary is not fixed but I have been reading some posts about the place. Is dec ok for driving into iya valley area and those mountainous places towards Kochi? Will there be snow and I under the weather is similar to tokyo? We wil be spending 4 days in Shikoku before heading to Kobe airport. Are we able to cover the north eastern part of Shikoku? Do not think we have time to cover west and south as we want to have a leisure pace.