Swimming hole at the old cement works: Wilson Road (off Pulham Road), Warkworth, Rodney, Greater Auckland The lake bottom drops off pretty quickly so if you've got younger kids, best to make sure they've got floaties or other.
Torpedo Bay Cafe. Best brunch venue on North Shore. Outside tables with the sea surrounding you. Always seems to be reasonably sheltered. Great to walk/bike to from Devonport park along the waterfront with the kids. Reasonable food. Always busy in the summer. Sells beer if Dad needs something a little stronger.