Some slick tricks for the hot sun with low humidity environs..... 1. Get a cheap cotton handkerchief the type they make those do rag hats out of (farmers hankies) get it wet and tie it around your neck. Keeping your neck cooler via evaporation, it also keeps your body cooler as well. 2. full sugar gum. the sugar helps with bolld sugar levels that will effect you even if you have no diabetes, in the hot low humidity areas. The gum has the added advantage of activating your saliva glands so you keep your mouth hydrated. That will keep you feeling better than just drinking water periodically. 3. Don't get a styrofoan cooler for the DV trip. The ice will melt way to fast in them compared to a better insulated version. But if you are determined to use just that form, get a cheap blanket to wrap around it and further cut out light from the container. Then you can also wrap it in white colored garbage bags to give it added insulation without adding to the color (black) that will absorb heat. 4. Forget about it getting dirty, go with light tan or white as the colors for clothing. Darker colors especially black will absorb heat and make you much hotter. 5. Get those silly hang around your neck small fans. That and that neck kerchief from #1 will keep you cooler. It looks silly, but when there is no breeze that small little bit will be a god send. 6. Stay away from caffeine drinks. They eliminate moisture in your body. The best thing you can take with you is sugared lemonade. That and lots of plain water. 7. Three thibngs are used to rehydrate a body that has become dehydrayted. Potassium (banans) Sucrose (anything sugared will work), and sodium (salted peanuts) So combining #6 with #7 you should have banas, salted peanuts (also has protein in them) and sugared drinks (non carbonated that also wicks away moisture) 8. Sit in your vehicle if possible whiel waiting for the right light. Under an umbrella in those environs (just like where I live) you can sunburn just as bad from the reflections. An umbrella will do very little to avoid that kind of burn. 9. Eat something small every couple fo hours. Preferably something with protein. A small piece of Jerky or those peanuts from above are good, along with bite sized pieces of cheese. 10. Don't hurry. In the heat you will be worse off hurrying and making mistakes than taking your time and not raising a sweat (you realy won't seat much but you will raise your thermal output hurrying) 11. If you don't care what you look like, periodially dump some water on your head under a good hat. Your head gives off the most heat, and in the no humidity it will evaporate and keep your whole body much cooler. That is if you have enough water with you, which you better. (a couple of gallons of just plain water per day. You will be surprised how much you will go through.