Originally Posted by
5khours
Atami is not the most attractive town in the world, but there are some decent Onsen and Ryokan there and it is very convenient if doing Shinkansen between Tokyo and Osaka.
That was my thought as well. I enjoyed the day course here on my last trip:
http://www.fujiyoshi.com/en/
I spent two nights in Atami (not there though, they don't take solo travelers) going from Kyoto to Tokyo and spent the day at Fujiyoshia. Quite enjoyable but I've only been to 3 onsen so I'm hardly an expert.