The tag should be fee=no if they are free and fee=yes when paid right?

I've corrected. The toilets are free.

Oh sorry a half tide pontoon is a pontoon (floating Dock) that can be used by boats for the period that the tide is highest (basically half the time).

I know the area very well but just not how to create it in openstreetmap.

Trying to add a half tide pontoon.