I'm planning now on calling amex and seeing what they can do about that lovely platinum card.
If you haven't called Amex yet - you might be able to have Amex merge your 3 cards so you keep the total credit line intact for your credit score & have at worst 1 annual fee instead of 3 (if you get lucky they might make the surviving card the longest-open one as well).
Also, at most CC companies the attitude of the folks answering the phone can...vary. Start your call saying you are just 'gathering information', and then if the rep isn't very helpful, say 'thanks, I won't do anything just now'. And then redial and try another rep
If on the first call the rep *is* helpful, run with it and take action while you have the chance!
An idea for FL mooring - if/when you buy a boat, how about checking with Realtors? I bet they have some very nice properties listed with docks that they would love to have a large, nice boat at to impress the prospective buyers...might be able to get cut rate/free moorage. I know in NYC it can make $ sense to purchase a boat vs. renting an apartment - so it I can see that it might make sense in pricier areas of Florida. Where I live, you can buy a house for $50,000 so it wouldn't be quite as compelling here.
Hey, one more thought - until you buy your own boat, how about asking boat owners or marina owners if they would like some free security and boat maintenance in return for your living on a/their boat? Would be a low-cost way to 'try before you buy'.