Go to a Botanical Garden
This garden is located in the city of Niitsu. It's quite a drive. And like most of my excursions, you'll need a map, a car, and probably a native. The Garden has quite a number of plants that I had never seen before. It's a nice place to spend a few hours. You can also 'hike' around the surrounding hillsides. Ample parking is available.
Check the webpage below for directions & map: