Restrooms are only available after calling the police. Certainly there's someone in the department that loves answering these kind of requests.
Should I take their invitation and come in?
Let's just help you out there in the restroom. What do you say? Need an extra hand?
Just don't go to the pool if you feel the need to go to the restroom.
Now you can see if the toilet is occupied through this window. Why haven't we thought of this before?