Yes they do, they have two showers
There are outdoor showers for rinsing sand off like at most popular ocean beaches.
Yes, the outdoor Beach type showers. No privacy.
There are outdoor showers at the parking lot. Unsure about facilities at campsites, etc.
No. The restrooms have sinks and flushing toilets.
Outside showers next to the dunes
No but there is a campground down the that you can go pay for showers at.
Yes, but it's outside. I think they do have changing rooms too.
Yes, they have outdoor showers at the entrance/exit of the dunes.
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