If you're spending some time in Tokuyama, Tokuyama Zoo and Shunan City Cultural Hall are top sights worth seeing.
When in Yuno, you can plan a visit to Amidaji Temple and Ohirayama Ropeway, some noteworthy sights in the nearby area.
You might consider checking out Mt. Eigenzan Park while you're exploring Miyanobaba and the larger Shunan area.
If you're looking for some top things to see and do in Kushigahama and surrounding area, you can visit Shunan City Museum of Art and History and Tokuyama Zoo.
While there might not be top attractions in Heta, you can explore the larger area and discover places like Mt. Eigenzan Park and Ohirayama Ropeway.