If you'd like some outdoor excitement, pay a visit to Mt. Ogasayama. No easy stroll around the block, this hike is great for some mid-vacation exercise.
You'll find this steep landmass in Kakegawa. Once you've done everything you can at Mt. Ogasayama, take a look at nearby Shizuoka Stadium ECOPA, Kakegawa Kachoen Park, and Kakegawa Castle.