as far as I know once you come thru the gate you've 'had your day' (which is why with afternoon thunder so common in the summer folks want their dolphin time EARLY)
HOWEVER there is a very liberal rebooking policy where if the weather is forecast to be a bust you can shift your date at no cost ...
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Rebook without penalties or fees - shift reservations, up to 48 hours prior to your reservation date, to any future date through 2021*
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