Here are some thoughts.......
If it is a warm enough day to do it, and you are prepared to get soaked by cold water, you could do it at the end of the day and then leave the park.
We sometimes do the opposite......we enter with park with swimsuits/T Shirts on, get soaked, change in the bathroom and continue on with the rest of the day in our dry clothes.
(Note- we wear flip flops on the ride and then put on our dry shoes and socks after)
It is a complete throw of the dice as to whether it will be above, at, or below the average temps for Orlando. You may have to make you decision the night before.
Like the posters after me here---we often ride 2x or 3x before moving on with our day