Hot Tubbin' Monkeys
If you like monkeys AT ALL, you must visit the Jigokudani Monkey Park in your trip to Japan. This is a sanctuary for the Japanese Snow Monkey, and the place you can watch them play and soak in the natural hot springs. It's in the middle of nowhere, really, a jaunt from the nearest major city and 45 minute hike from the nearest road, but seeing these wild monkeys soak in the hot springs is really a great experience. If you want to make a day of it, stay at the nearby Korukan Ryokan, which is literally a stone's throw from the Monkey Park. The staff there is wonderful (seriously, I fell while I was there and broke my foot and they got me and my husband to the local hospital literally over the river and through the woods) They have several natural hot spring baths, a wonderful dinner service, and monkeys frolicking outside of your room. This was the greatest adventure we had in Japan. Highly recommend it to anyone with an affintity for Monkeys or just the outdoors away from the hustle-n-bustle of Tokyo.