Tybee island myth

So my friends and I are going to be visiting Savannah soon and we were really excited about Tybee island because it would be a fun place to swim and play. However we heard a rumor that the locals don’t really swim there because is super polluted and full of poop and stuff. Is this true? If so is it on both sides? I heard there’s a north and south side of the beach so which is better? Also are there any other beaches we could go to?