I have heard that the Hawaii DVC will have a Wedding Pavilion but I don't know for sure if that is just speculation. The resort is not scheduled to open until 2011 I believe.
Why can't you just send the kids to the kids clubs? No need for parents to sit outside, that is just silly. The kids will have a blast and the parents can have fun too. So many receptions are adults only.
I think it's for sure on the HI DVC wedding area(I've seen the sketches of the resort and I believe it's open air, not an enclosed building). They just started digging out there as some of the JW Marriott guests have been complaining on Trip Advisor about the noise. We're going for 2-3 weeks next summer, been bracing myself for the sticker shock of air fare for 4. We've done Europe many times so I won't be too .
We used to go to a great resort in Northern Michigan that had a great kids club, room for babies, toddlers and up. My 7 yr olds been doing "kiddie clubs" since he's been 2. He has always loved it, always "makes a friend or 2". Now the 12 yr old sulks, but ends up having fun.
Drop them off for all day, 1/2 day or just for an adult only dinner. Great in the winter because they would take them to and from their ski lessons.