Ambury regional park is a huge working farm in the southern end of Auckland. It's out of the way but not too remote, rural and restful, and packed with activities to entertain a large group.
Gems of Milan: Sforza Castle & Sempione Park
Sforza castle shelters several museums and art collections inside, of which the most notable works include the Sala dell Dasse by Da Vinci and Michelangelo's unfinished sculpture of Pietà.