Buy online. You can add in park but it will cost more a la cart
Online prices are cheaper, Drink pass is the best add on that Carowinds offers, in my opinion! We definitely get out money worth out of it every year
You are better buying it on the website that's what I did
Both
Download the app you can do just about everything on it.. Very convenient and usually has better deals
Purchase online
Both will work
Either
I suggest adding it online before entering the park because it is cheaper.
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