The last K-On locations I visited this time were 2 places shown in the OP for the first season.
Image from S1E1 - 03m02s
This is at the Kamogawa delta where Kamo River and Takano River meet.
View of the whole area. I've been here before and taken some pictures for the café seen in The Eccentric Family of course.
Image from S1E1 - 03m00s
Here's a location I've not been before though, the old aqueduct at Nanzenji Temple.
Full view of the old aqueduct. I've marked the path from the river delta to this temple in the map below.
These locations were visited on 2015/11/01, 2015/11/05 and 2015/11/06.
Nanzenji Temple official website
Special thanks to the ones who went here before: