Hinata Sou is the place where Keitaro and the girls stay. It is a rather big Inn., but not big enough for Keitaro to hide from the wrath of Naru. ^^Anyway, Hinata Sou consists of several different rooms. Each girl (and Keitaro) has their own room. It would be a nice place to stay! With the girls that is. Without them it wouldn't be all that great of a place. ^_^
On the outside of Hinata Sou is a hot spring! The girls use it to bathe in or just to relax. Luckily for Keitaro, he gets to clean it. Keep in mind that usually when he is cleaning it the girls sometimes come out to get in the hot spring. With only bathing towels on! ^^
Well, this pretty much sumarizes things up about Hinata Sou. Any new information I gather I will post it here.