Well, I'm the one that mentioned the bathrooms and the showers and I maybe should've been more detailed. Raquel is right - they are very basic (not really enough room to change in) and the showers are outside - just enough to wash the sand off. We wore our bathing suits underneath shorts and T shirts.

As far as Sat or Sun, I'd suggest early Sun.

Thanks Raquel and dfr4848 for the clarification.