It doesn't matter what upgrade I put on my staff building, my park staff will not use it and I don't understand why! Is this a bug that needs reporting?
Do you have "Staff Management Features" unchecked in your game options? That's the only thing I can think of that might be the cause. They should be using it even if there's a terrible scenery score & zero upgrades.
How far away is it from your Shops?No, I just checked and it's not unticked, so is there any other reason they could be refusing to use the Staff Room?