Yamanashi is probably most famous for it's nature. Most trails in Japan feature mountainous terrain. These trails are usually most accessible during the summer and early fall, however with the right equipment many hikes can be done year-round.
Please note that we haven't applied a standard for adapting Japanese place-names into English. Most places will therefore be titled as they are used in common speech among the community.
Be aware that there are potentially dangerous wild animals such as boars and bears in Yamanashi, as well as some hunters. Bright colors and bear bells (small cowbells sold at most outdoors stores) are recommended while hiking.