If you've never had your boat out in open water, you might think about modifying your trip plans and doing a week at Disney and then doing a week in the keys rather than trying for Bimini. There is great boating in Central Florida and some is very close to Disney. I live in Orlando and I'd be happy to give some you some info.
I have a 23' FW deckboat and I wouldn't even consider trying to do the Bimini crossing in it - even if the weather looked perfect. As a previous poster mentioned, you have to cross the Gulf Stream and the forecasts always say "Waves higher in the Gulf Stream" but rarely define higher. You really don't want to be out in anything over 2'. We were out in Tampa Bay once and I had checked the weather the night before, but didn't check it again right before heading out. We got caught in 4'+ seas IN THE BAY and it was seriously no fun...and it happened completely without warning. The problem is the lower freeboard on a typical open-bow sport boat causes the boat to act like a shovel if a wave comes over the bow...I'm definitely not an expert, just have some first-hand experience.
Anyway, by going to the keys you can test out both the Atlantic and the Gulf (Florida Bay) side and get a feel for how your boat will respond to various conditions, etc and get a feel for what to expect for a given forecast. There's plenty of boating, snorkeling, etc to keep you busy. If the weather is poor in the Atlantic you can generally still do the Bay/gulf side as it's usually just chop rather than swells. You'll need a decent GPS and charts because the water on both sides is very shallow. If you're interested, check out this site
http://www.bootkeyharbor.com - lots of good info, waypoints, etc.
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'99 234 Candia Funship, 5.7Gsi SX

