we went that way last week, launched at bahia honda park and sailed south of key west. we did plan to go to marquesas, but it was so cold and rainy that we decided to turn around at boca grande. charts I had in my GPS are no good down there in the shallows, everything is not where it is supposed to be. I found google earth more up to date and useful, you can see all channels very clearly and they seem to be in right places more or less. there are many good reefs on the way, as you probably know being from around there. but nothing really to do on the shore, no much of a shore to speak of. mangroves and sandbars.