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Look at what activities are planned and bring suitable clothing for them. Bring one pair of blue jeans or other sturdy long pants in case there are activities in the evening, when it is cooler. Bring a hat if you plan to be out in the sun for long periods of time. Bring a pair of comfortable walking shoes for activities where walking and standing are normal, and possibly flip-flops or sandals for walking to the pool or lake to swim or boat. Consider wearing a swim suit under your clothes.
If you will be swimming, it might be a good idea to bring an extra suit, so you can allow one to dry while using the other on an alternating basis. Bring shorts, tee shirts, and extra socks, especially if you will be doing any hiking. For colder regions, a sweater or light jacket may be appropriate for nighttime activities. Wearing a hat with a wide brim will protect your face from the sun and make you feel a little cooler in the heat of the day.