yeah i'd stay at least 50-100 yards from that pier if your going to snorkel or scuba. there are tons of hooks and stuff in the water with fishing line to get entangled in. even if its closed i wouldnt get anywhere near it, just too dangerous with the rocks, wave action, and giant cement supports coming out of the water. I have also been out on that pier fishing, the little bait fish are fun and easy to catch, and witnessed the local fisherman trying to land their hook ontop of the diver. its understandable why they'd try to do this although, divers are scaring the fish which they are trying to make a living off of. just be careful and keep your distance and you'll be just fine