A whopping 130 acres to explore, filled with rare trees, woodland and wildflower meadows. Hunt for peacocks, hug the towering Giant Redwoods and tackle the Ninja Warrior-style natural play area, with an agility trail, traversing wall and den building. There are fallen trees to clamber over too, or little legs can follow the easy one-mile Arboretum Amble. Under 16s go free.