Do they allow day guest to visit other guest staying there? If so how much is it and what times? Do they also have to pay for parking?

They allow guests. They do have to pay for a day pass for river access unless you are not over your occupancy limit...then they just need wristbands.

Oooo not sure. But the way its set up i dont see why guests would be a problem. No costs for parking. Our cabin had 2bdrm and we had 3 cars