i love Ripleys, we go every time we go to Florida and i never get bored of it!!
As mentioned by other people Titanic is also good and wonderworks. There are vouchers for money off all of these attractions in the little books you can pick up in ponderosa/shopping malls etc.
we were going to go to skull kingdom last time we were there but when we went in there was a bloke arguing for his money back, so we left!!