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Dress lightly (but take a jacket if you need to) and take only what you need. If you take your own food, check the park permits this and make sure your amusement park offers storage first. Try to check the weather report for the area you're going visit. Dress accordingly for the weather. Try to avoid wearing dark colored clothes (such as black or dark grey) if it is during summer. Wearing these colors could make you warmer and you may start sweating. Also, if you're going on the water rides, have a swimsuit on underneath your clothes. Flip flops aren't really the best idea for an amusement park, especially rides that leave your feet dangling. Wear supportive sneakers or walking shoes. If you want to wear a hat, always remember to put it in a secure pocket before going on a ride. Keep your wallet or purse secure! They can be easily lost in the hustle and bustle of an amusement park. Hair past shoulder length can easily get tangled on a windy ride. Braids are recommended, as they stay closer to the head and don't have loose hair like ponytails. Many coasters can be rough, and you don't want holes poked into the back of your head. Some earrings may get stuck in your hair or attire. However, if you really want to wear earrings, wear non-dangling ones such as studs or pearls. Especially in the summertime. Most of the ride lines will subject you to the elements, whatever they are. Take a water bottle. It's easy to get dehydrated out in the sun all day. Unless you're visiting with someone who won't be riding most of the rides, don't take huge bags or purses with you if you can help it. You won't be able to take these on most of the rides. You'll either have to leave them with a non-rider, pay for a locker, or stuff them into bins before getting onto a ride. This last option offers no guarantee that someone won't walk off with your brand new Coach purse while you're on a coaster. Wear something with big pockets that either zipper or button closed. All you really need is some cash, and maybe your phone. You can always leave a jacket in your car, and go get it later. Always take medication with you or take it beforehand. Who knows, you might need it.
Consider your attire. Wear good shoes. Don't wear loose clothing. Tie up long hair. Don't wear earrings. Take plenty of sunscreen. Don't take a ton of stuff.