Which Gatorland are you looking at? There are two.
The one in Kissimmee is pretty cool. Tons of alligators and crocodiles, some cool shows, and some damn tasty gator ribs and fried gator fingers . No coasters or anything, but it's interesting enough.
Gatorland in Lakeland is, for lack of a better term, "teh suck". Don't go.
If you're going to Busch Gardens (which you really, really should), I wouldn't bother with either Gatorland. Unless you've got an alligator fetish or something.
As for Cypress Gardens, unless you're a credit whore, it's probably not worth it. That money would be better spent elsewhere.
IMHO.