Most likely another location from Onegai Teacher, according to another location hunt site these swan boats appeared in the opening. Onegai Twins Opening doesn't seem to have any...

Since I haven't seen Onegai Teachers, not much to say about this location. Simply took a picture of this location because it's marked on the map. To somewhat make it interesting I added a picture taken from the Shrine nearby looking at the lake. Notice the sawn boats ~_^

Weather seems nice in the last picture, right? That was in the morning at around 7:00 AM, in the afternoon it became rainy again.