There are a couple of beaches near us which have public toilets available. They are not beautiful - beige, tiled cubicles that smell slightly of bleach - but they are mopped out a couple of times a day, have loo roll and are clean enough. Whenever I use them, other women seem to spend a lot of time moaning about using them before they’ve even got into the cubicle.
I’ve seen disgusting public toilets and, really, these are not. Just a bit dated. And frankly I think it’s amazing that they are still there (it’s a really small place). If you need to use a loo, they will certainly do.