Arboreal nirvana, Eastwoodhill Arboretum is the largest collection of northern hemisphere trees and shrubs in the southern hemisphere. It's staggeringly beautiful, and you could easily lose a day wandering around the 25km of themed tracks in this pine-scented paradise. It's well signposted, 35km northwest of Gisborne.
There's basic accommodation in bunks and private rooms (dorm bed $35, double room $120, both including garden admission). Meals are available by arrangement, or you can use the fully equipped kitchen (BYO food as there aren't any shops nearby).