Question 1

Where is Sankyoson observation plaza?

Accepted Answer

Sankyoson observation plaza is in Nanto, Toyama, Japan. You can see its exact position from the map coordinates and the Street View link.

Question 2

Which scene of YuruYuri Summer Vacation! does Sankyoson observation plaza appear in?

Accepted Answer

Sankyoson observation plaza appears in OVA of YuruYuri Summer Vacation!.

Question 3

Can I visit Sankyoson observation plaza?

Accepted Answer

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

Question 4

Where was YuruYuri Summer Vacation! filmed?

Accepted Answer

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