OP. It looks like you've received a lot of good ideas from other posters. The only other thing that I would add is to go ahead and use some of these suggestions, but no matter what the results don't let a little sweating ruin your fun. You certainly will not be the only one sweating from the heat. If you look around you there will be sweaty people, tired people, people with hair that doesn't do well in the humidity, and women having issues with makeup in the heat. On our last trip my wife got an ice cream cone on Main Street that she attempted to eat while walking across the park. It was so hot that it started dripping faster than she could lick it up. She ended up with ice cream running down her shirt and shorts. She cleaned herself up in the bathroom as good as she could but was still a little self conscious. Like I told her, there may be a few people that noticed, but she probably would never see any of them again in her life, and she did enjoy her ice cream, so it was worth it.