after a day at Appi Kogen, friends and I decided to find the local Onsen, aka hot spring. we found Matsukawa, and glad i talked them into the detour. we arrived with only 30 minutes to spare before the Cave became women only, or women onry, depending on who you talk to. 5pm men can't bathe in the outdoor "cave" bath. if you are heading that way as a couple or in coed company, be sure to plan ahead. we spent about 30 minutes in the spring, and that was plenty enough for a pre-2hr drive home soak. the lodge is distinctly japanese, with a wooden bridge that leads across the river to the cave. after reading their handout i found there are 2 other areas there with baths, but we didn't investigate. again, well worth the drive up the mountain. next trip up i'll give the outdoor bath that overlooks the river a go.