Barry, the place is always crawling with house apes.
In our own encampment, we have expect to have bigchuck's two grandgirls, and our friend Dave Guertin's four, at a minimum. And all six are within a couple of years of that age range.
There are quite a few kids' activities, although when they get to that age they'd usually rather go off somewhere and mutter about sex, or what's wrong with adults.
One of my kids has threatened to come, but he's 26, an MIT graduate working for Intel in Portland west, and thought he might fly out, since he's never gotten to one. So I don't know if he'd be that much fun for your kids to play with. Although he might be able to talk about computers with them, which the rest of us probably couldn't.