we had to cut our 1 week vacation on Sanibel island short because of rash on our skin after wading/swimming in Sanibel/Captiva water.
The rash did not appear right away after contact with water but a few days afterwards, until today, 4 days later, I still have a new raised rash come out, sometimes with blister. None of us experienced any respiratory problem but I heard that it come also come one week after the exposure with water contaminted with red algae.
I asked the local and they said it depends of the senstitivity of your skin, so it maybe okay for some people but for me, it is pretty bad.
Better to check the water condition first if you plan to swim in the water. I think they have a website and tel. nr where you can check the status