There are many ways to cool off in WDW. You just have to be creative or keep your eyes open...
MK/EP/MGM/AK:
- Walking through stores is a fun way to cool off. There are a lot of them in the park, and some of them have interesting / eclectic merchandise too.
- Quiet attractions can be your best friends on a very hot humid day
- Go on anything that moves, even if it is outdoors. At least it's a breeze of some sort.
- Don't be afraid to wait in a long queue line that is all or mostly indoors. The wait may be long, but the building and ride are air conditioned.
- Cold snacks such as slushes, ice cream, or a cold drink will help you cool off.
MK:
- Of course, attractions that involve water are your best friends (Jungle Cruise, Pirates, Splash Mtn, Thunder Mtn, Small World, Ariels Grotto)
- In Tomorrowland, you'll find something called the Cool Ship (I think that's the name), which is an elevated rocket ship with misters underneath it.
- In the heat of the day, explore Tom Sawyers Island. The island is basically covered in shade, and there are buildings you can walk in (Fort Langhorn, Harpers Mill, and the Windmill), and you can walk through three caves too.
Ep:
There is no reason to overheat in Epcot.
- Almost all of the pavilions in Future World are huge buildings with rides, displays, and shows inside them. You could spend hours in a building without ever setting foot outside.
- World Showcase has more than shops that will keep you shady and cool
- If it's a little windy, you can stand by the Innoventions fountain and get pretty wet.
- Ice Station Cool in Innoventions has a tunnel with real snow, plus free cold drinks from other countries inside the main building.
- The Test Track ride includes experiences with cold temps and water, not to mention a 64.8 MPH breeze courtesy of the speed tests.
- Maelstrom, in Norway, may get you wet
- There is a large waterfall in Canada that will get you wet if you stand close to it.
- Between Innoventions and World Showcase lies a fountain you can run through.
- Of course, the quiet rides and shows are your friends if you want to cool off. Don't be afraid to take your time in Innoventions, or to watch Food Rocks or Cranium Command.
MGM:
- You can get pretty wet on the Baclot Studio Tour. The movement of the ride vehicles provides a decent breeze, but Catastrophie Canyon can leave you very wet.
- The Honey I Shrunk The Kids area has some wet opportunities. It's reasonably well shaded too.
- There are misters on Mickey Avenue, by the Backlot Tour entrance.
AK:
- Kali River Rapids is always refreshing. However, the line will very likely be long.
- Rafiki's Wild Planet is an air conditioned building similar to a pavilion in Epcot.
- The Pangani Falls Trail has a couple areas to cool off (Hippo exhibit, among others)