We did the Malihiki (sp?) Luau at SeaWorld last week. My in-laws (in their mid-50's) really enjoyed it. I would have preferred that the meal not be served family style, as there were 5 of us and I was the odd one left sitting and sharing food with three strangers...other than that, it might be something fun for you to check into as well!
We've done the Medieval Times as well, but that was back in 1993 on our honeymoon, so not going to vouch for that one as that is a LOT of time for things to change!