Replying to Summer Trip to Hood

So quite a few of my friends (10-15 people) and I are planning a road trip from Wisconsin out to Timberline to ski for roughly 3-4 weeks

I know the conditions are sunny, corn snow, and all that good stuff.

What i need to know

Is there a summer pass? If so how much is it?

Living places? Should we rent a house for a month (i heard you can do that but not sure) or just camp out somewhere?

Also, whats there to do besides skiing, like what to do on rest days and that sort of thing?

Any other info/things to know that you can provide would be great.