A stones throw from my old Primary school!
The kids will love the beach - which one? Me personally I would go to Port Noarlunga as I think it is better than Christies. Also, try Silver Sands just past Aldinga Beach that is nice as well.
Be warned if you go the chippy near Ray Whites on Beach Road they like their salt!!!!
Another area we liked was Trott Park and Aberfoyle wasn't bad. O'Hallaran Hill is okay as well.
By the way that area of Christies didn't seem to bad.