Nasu Highland is in a mountainous region a couple of hours from Tokyo. The terrain of the park is hilly providing for a good workout.
The park offers a lot of coasters and dozens of flat rides. The coaster rides are nothing to rave about, but the manner in which the park interwines 4 coasters is stunning. The other rides help define the park. Rides run the gamut from family friendly dark rides to high intensity flats. The parks offers plenty of shaded areas inlcuding an area where you can even fish (you have to pay the park to cook your catch).
Don't fret if you don't catch your own lunch as the park serves a good assortment of food.