I've been to Kagawa! What kind of information are you looking for?
Kagawa was important in the Gempei Wars, so there is a lot of history regarding that in Kagawa.
There is a lot of nature, and I forget the names, but there are some famous gourges there and tons of mountains.
And Shikokoku is famous for its many temples. I would start out with Konpira-san.
There's a ton more to be said about this part of the country, and I'll try to hunt down some pictures I have of the area later tonight.
Good luck and have a great time!!