During my internship in Japan I traveled around a lot, one of the place I went to is Kizaki Lake. The reason why I went here is because this place was once used as setting for the anime Onegai Twins. Apparently this place was also used for the anime Onegai Teacher, which I haven't seen (yet).
Guess you can call this trip a "location hunt", finding the real locations that appeared in the anime.

So far I've visited Kizaki Lake two times, if possible I would like to visit this place one more time before leaving Japan. Really like this place and definitely recommend you to go there (even if you don't know what anime is)!
I like this place so much that I even made a webpage for it! A lazy and unorganized person making a webpage specially for one location, says enough about how amazing this place is.

Click on the pictures on the map below to get some descriptions and more pictures. Pictures on the right are thumbnails, click on them (pictures will open in a new window). Just explaining how things work, since I'm not good at making web-pages. People always tend to miss things that I make >_>