Pretty sure it is permitted.
Not sure about scuba because I didn't see anyone with tanks but tons of snorkeling but there are also boats that you can buy tickets for and they take you out for stuff like that and para sailing
Just make sure to pay attention to the flags flying for warnings
It is permitted but not sure how much you would see unless you go very far out. Most sea life goes farther out to avoid people near the shoreline.
Didnt see that there?
I imagine so if you want to.
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