Michelle, is it $51 or $55?
It's both, actually.
I'm fairly sure that admission is still $51.95 ($51, rounded down). Tack on the 6.5% Florida sales tax and you get to $55.33 ($55, rounded down).
You can't forget sales tax -- just as you can't forget lodging taxes at hotels (which will add another 11-12% to the rate you are quoted).