mbethel,
Did they offer you the wait list for the CR? They close it at a certian point, not sure but I think it is at 30 days. Another option would be to call daily as you approach the 30 day mark. You have to cancel your ressies at 30 days or lose the deposit. Last year, we called right at 31 days and were lucky to get CR. We didn't have one night covered there, but they notified me two days later that that day had opened up too. I just stayed at CBR on overflow rate, and it was the same as rack rate at a value resort. At first he only mentioned two overflow rates for on-site hotels, but when pushed, he read me several more. Don't give up if you really want to stay on-site. I would also call POR directly and ask them about 3 adults/5 to a room. I also don't understand why POR would not allow this but CR would?
Again, be persistent and if you don't get an overly helpful person, call back later - I am sure they have bad days too, but they do have some really wonderful people working there!
Happy Planning!