Question 1

Where is Joukaen?

Accepted Answer

Joukaen is in Kyoto, Japan. You can see its exact position from the map coordinates and the Street View link.

Question 2

Which scene of K-On! does Joukaen appear in?

Accepted Answer

Joukaen appears in EP3 of K-On!.

Question 3

Can I visit Joukaen?

Accepted Answer

Yes. Joukaen is a real place you can visit. Check what it looks like on Street View before you go.

Question 4

Where was K-On! filmed?

Accepted Answer

Anime and manga are not filmed the way live action is. Their backgrounds are painted from photographs of real locations, and Joukaen is one of those real places (EP3).