I want to add the the Naples, marco, sanibel, ft. Myers area....the water isn't blue, Aqua blue. Yes we see some blues n it but it's not carribean blue.
My sister lives in ft. Myers and I can't remember if it was last year or the year before but she went out to sanibel a few weeks prior to our visit and said the water wasn't great, aka pretty. When we went and drove over the causeway you could see the blue/green hue and then she came with us another day that trip and was amazed at how much Better the water looked.
But that being said, I love the gulf coast of FL. It's more laid back then the Atlantic beaches. I liked it when I was 18 and I like it now that I am 43.
I am headed to costa caya or whatever it is called in about 10 days which is the island north of captiva so I am curious to see if there is any change in water color. We are only going for the day as we are renting a boat. But I think the water will be a little different because it will be getting less of a run off from lake okeechobee.