Loose fitting, light colored clothing for when you're out in the sun. Open sandals, tevas, etc and hiking boots if you plan any serious hiking in the canyons. During the peak months of summer it is usually warm enough to sleep outside or in your tent with your sleeping bag unzipped. There's lots of ants on the campground though, so you may not want to park your sleeping bag directly in the sand. Also a light rainjacket might be helpful in the event your caught in a rain storm. A hat or anything to cover your head from the relentless sun.
Toiletries and Medical Supplies: Lip balm (I find that Carmex works really well), sunscreen, and lots of water.
Camping/Beach/Outdoor Gear: If you're going out on a rented boat all day, it's worth considering bringing a cooler full of ice and cold drinks along. A cold drink on those hot days is a marvelous thing.
Luggage and bags:
Pack light, you are on a boat. Try to collaberate with your traveling companions on things you can share.
Clothing/Shoes/Weather Gear: Shorts, t-shirts, swimsuits, hiking sandals (ones you won't mind getting wet), a hat, sunglasses.
Toiletries and Medical Supplies: SUNBLOCK! You are in the middle of the lake with the hot Arizona sun beating down on you. I forgot to put sunblock on one day and I got a 2nd degree burn on my shoulders. If you do get sunburned, you'll want to bring some aloe. Banana Boat makes an after sun lotion that has aloe in it. That is my favorite because it helps to keep the skin from peeling.
Photo Equipment: A camera is a must, but if you are clumsy like I am, then use a camera strap and try to get a disposable waterproof camera.
Camping/Beach/Outdoor Gear: Look out for scorpions and snakes when you go ashore. At night we pulled our boat up to the shore and parked it. There are wild animals on land so be careful!
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