We took an airboat tour at Sawgrass Rec. this August, and we had a great time! It was a totally memorable adventure, and our captain was very informative...and witty. We even got lucky and saw a gator!
After buying keychains with our pictures on them (and having the lovely ladies at the photo booth make a dozen more), we went to the wildlife area. It was hot, so we couldn't stay for long, but the whole family got to hold a baby alligator! There were lots of other great animals, including Florida panters, wolves, and even a peacock, and we had a great time...good thing the gift shop is air conditioned, we spent a lot of time in there.
For a good time in Fort Lauderdale, go to Sawgrass Recreation Park!