Is there a lodge or an area where adults that are not skiing can hang out?

There is indoor restaurant as part of the building where you purchase the tickets. I think that might be a option. Of course it might get crowed based on the day/time you go.

As Ravi mentioned, there is a closed lodge kind of place where people rest and eat, however it is very small place and gets crowded very quickly. Also, it is quite cold inside too, bc if the downstairs and the doors that open and close very often. Just fyi to know what to expect :)