Finance. I assume you were looking for tourism or fishing. Tourism is our 7th largest sector and fishing isn't on the list. It was a surprise to me, I'd always been told it was farming (citrus, trees, etc) and trade (port of Tampa, port of Miami).
Here's the breakdown:
Florida: real GDP by industry 2019 | Statista
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Edit: I looked further. Farming is the #1 employer and transportation (trade) is #2. They want you to register to see that info, I guess they're trying to sell subscriptions to the site. So if you judge by people employed instead of dollars then Farming is #1. Just by dollars, then it's finance. Neither of those are what people visit Florida to do, so it's not what we're known for.