Hire a guide or take a tour. My wife is Native Japanese and she had a hard time finding it with a map and good directions. We went in the Winter though when the lower access road was closed. We had to find the upper parking lot in the park and walk about a milte on a good trail through the forest to get ther. But, Winter is when you can photograph them in the snow.
Nikon D800e, Nikkor 14-24mm f/2.8, SB-900 flash set to flash EV -0.7
The Famous Snow monkeys in Japan are a must do for every wildlife photographer visiting Japan. The monkeys in this wildlife park, Jukokudani near Nagano, are feed by the employees. This creates an environment where one can photograph the monkeys in very close quarters.
When I photographed these two a younger junvenile ran between my lens and these two brushing up against it. I had to stop shooting for a while to clean the water that he rubbed onto the front element of my Nikon 14-24mm f/2.8 that I had set to 14mm as I photographed these two. I was was about 18 inches away from these accepting creatures.