Hot Spring

Tomorrow, I'm going to a hot spring in Yamanashi with my wine friends.
Yamanashi is one of the most famous prefectures for wine in Japan (quality and quantity). So we will drink lots of nice wine while eating delicious food.
Actually Onsen is not so bad, but I wanted to see biiiiiiiiig and huuuuuuuuge vineyards in foreign countries. I tried to persuade them to travel overseas together....and some of them said "yes". Maybe next year, we will go to France or California or somewhere.

I heard that also in America there are some useful guidebooks about nice Onsen places...maybe called "The perfect guidebook of hot springs in America" or like that. I doubt it, but I want to get it. So I asked my pen friend whether he has heard about that or seen them ...or has it already.
I'm now waiting for his answer.