In episode 7 of season 2 of K-On we can see Megumi Sokabe sitting near a statue at the end of the episode. This statue is located on the Hitsujigaoka Observation Hill in Sapporo, so I went to take a look. The closest subway station is Fukuzumi Station where you can take a bus that goes all the way to the top of the hill.
Image from S2E7 - 20m45s.
Statue of Dr. William Smith Clark. The statue has the saying "Boys, be ambitious!" on it which was said by him.
Image from S2E7 - 20m52s.
The area where Megumi is sitting.
Image from S2E7 - 20m57s.
To the right here you can see the Sapporo Dome.
Image from S2E7 - 21m00s.
Closeup of the statue.
Up on this hill is also a Sapporo Snow Festival museum.
Among other things they have models of some snow sculptures that were made, including this one of Sazae-san which is the longest-running anime series.
And one of One Piece.
This location was visited on 2015/10/29.
Hitsujigaoka Observation Hill official website