Iwateyama Monkey Park is the very first Monkey Park I visited in Japan.
Looking back, the instructions from the park's official website is the most accurate than directions found on other pages. (I followed the information found on Japan-guide.com and got lost...not fun when it is super humid).
Its a long way up a very steep mountain, but the view and experience of feeding the Monkeys will be worth every sweat!
If you like Monkeys and find yourself in Kyoto, it should be a must visit.
Take some ice cold water, insect repellent, umbrella, and wear comfortable sneakers and you should be set!