snorkeling in key west

We're going to key west this Wednesday. One of the goal is to do one snorkeling. My sister had been to Largo Key and she doesn't recommend it. One of my friend says Looe Key is great. After googling for a while, we've found another candidate, Dry Tortugas. However, due to our tight schedule, we can pick only one, which one should we choose, or are there other better snorkeling sites ?

I'm not really sure, although I suspect a lot of what you will find will depend upon who you end up going with.

I went snokeling with an outfit out of Key West and had a good time, but that was 15+ years ago and I couldn't even begin to tell you who it was with or where exactly we went.