Are there flush toilets and showers for non campers

yes there are both

Restrooms in or near all buildings. Showers are outside.

Yes there are toilets amd showers to rinse off after the beach for non campers

Out door showers with no screening. With toilets that flush on the inside.

Yes, I believe so.

There are bathhouses on both sides of campground - tent camping/no sewage hookups and side with full hookups

Yes they have...

Yes