I would have thanked you on the end of my original post but I can't reply to any posts - seems I don't have the power! but I didn't want you all to think I hadn't read your helpful ideas.
Thank-you; we ended up at the beach again (no bad thing!).
Could try some of those others out - although I was hoping for something more like this http://www.marrickville.nsw.gov.au/c...rplaypark.html but the beach is good too.