Yes ask the park ranger !
Limited freshwater fishing OUTSIDE the main park/campground. Half a mile east of the park gate. Ask at the front desk. Brackish water inside the main park easily accessible- again, check at the office or any of the rangers or volunteers. Good luck.
Kinda, depending on the tides you can expect brackish water.
Access is to the Ocean. Should be Sweetwater at best.
Yes with a boat launch
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