This is a short hike in the Jigokudani Snow Monkey Park to see the Snow Monkeys - they're actually Japanese Macaques, native to northern Japan. The 1.6km (one-way) track leads gradually uphill in a forest before opening out in the valley, where a river runs below.

Spend a good amount of time watching the monkeys, who just sit in the hot springs and occasionally pick bugs out of the hair of others.Try not to come exactly on 12pm, because they're fed then - it's cool to see them running around, but they're not as cute as when they're in the baths!