Rash Guard or Wet Suit

I am going diving in Key Largo next weekend and the water temp is supposed to be in the 80s. I have never dove here so i wanted everyone's take on if i should bring my wetsuit -3mil, skin suit which is like 1mil, or a swimsuit and rash guard would be fine, i lean toward my skin suit mainly for safety purposes. i have been stung by jellies in the past in Florida but that was on the gulf side. The water temp seems like a rash guard should be fine. anyone have any advice for what the water is like in Key Largo right now?