Another thing I thought of and forgot to mention....umbrellas. I use to laugh at some of the people down here in FL who walk around under an open umbrella in the sun. Until I had to 'improvise' a shelter on the beach for family who are sun sensitive. (yes I know it reflects off the sand too......I needed something.) That umbrella provided A LOT of shade and cooled off several family members. The temperature was noticably a few degrees cooler. Now I try to make sure I always have at least a compact one handy. Doesn't take up much space and can keep you dry or provide shade.....looking back I think I remember that I think I saw it in an "outdoor" book under survival gear.