Hiya Amy!
Oh yes, you should definitely get a DoleWhip in September!
DoleWhip is a pineapple soft-serve ice cream/sorbet that you can get alone or swirled with vanilla soft-serve. They also have a Citrus Swirl that is orange and vanilla soft-serve swirled.
Or, you can get my favorite which is the Pineapple Float! The Pineapple Float can be pineapple or orange soft-serve with pineapple juice.
My family makes a point of stopping at the Aloha Isle Refreshments in the Magic Kingdom's Adventureland every chance we get...it's become a tradition.
I hope that you get a chance to try a famous DoleWhip treat this September and that it is as enjoyable for you as it is for us!
Also, watch out for the brain freeze!