One of your first stops should be Yokoyama Kyodokan. Here, you'll be able to orient yourself and pick up some great ideas before you begin exploring.
This tourist information center in Tochigi is well-liked by travelers, so leave a spot for it on your to-do list. However, don't end your sightseeing there. There are plenty more places waiting for you to explore after Yokoyama Kyodokan. Oyama Yuen Harvest Walk, New Ginger Museum, and Tochigi Kuranomachi Museum of Art are nearby.