There are a couple of parks in Monterey, and one park where we have stayed in Carmel that can take 45' coaches. You can get to Big Sur from the North, (technicaly you are not to be on Hwy 1 with an over 40' coach) but there are not any campgrounds, and very limited parking for a large coach. The better option would be to stay in Carmel, and take the toad.