First I want to mention a storage place that is part of the same company that Fred mentioned, River Forest Marina in Stuart so that is east coast. They promote themselves as having a hurricane resistant building and it is air conditioned so that you do not have mold and humidity problems.
It is considered a harbor of refuge to most insurance carriers for discounted rates.
Here is the tax info copied directly from the link posted earlier. They key item is that you owned the boat for more than six months. If you kept the boat in Rhode Island where there is no sales tax for a year of more than there is still no tax due in Florida. After 90 days you are required to get a decal showing the state registration fee is paid even if the boat is documented, but it is not normally enforced unless you get in trouble for something else like speeding or a large wake etc.
Use tax and surtax are not due on boats brought to Florida if you meet
[FONT=Arial,Arial][FONT=Arial,Arial]all [/FONT][/FONT]of the following conditions:
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You own the boat 6 months or longer, and
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You have shown no intent to use the boat in Florida at or before the time of purchase, and
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The boat has been in use 6 months or longer within the taxing jurisdiction of another state, U.S. territory, or the District of Columbia. Time spent in foreign waters does not count as part of the 6-month period.