The main attraction here is the fascinating Fruit Museum, where you can explore the history of fruit through the centuries, with particular emphasis on the role of fruit in the history of Yamanashi Prefecture. This sounds like a must-see destination for elementary school field trips, but the day we were there the Fruit Park was actually filled with adults.
Perched on a high plateau above the surrounding hills, this fruit-themed complex is housed in several large geodesic domes as well as a few outdoor arbor areas. Next to the Fruit Museum is the Fruit Theater - we were hoping to see an elaborate musical production featuring giant dancing grapes and peaches, but unfortunately all we got was a small movie theater showing an educational film about agriculture in Yamanashi.
Above the theater is a large and steamy tropical greenhouse, and next door is the Fruit Plaza, where special events are staged. There's also a library, a large gift shop, and a "fruit restaurant" serving a few fruit-themed entrees.