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Bring a blanket and insect repellant, plus plan a good spot to park and lie down where you won't get hit by passing motorists. Go somewhere that has a dark-ish sky, especially in the northward direction, but if you have a dark sky in whatever direction, just watch the darkest part of the sky. You'll see about one meteor per minute in areas that aren't light-polluted, less depending on how much of the sky is glowy.
Don't just stand and crane your neck, or you'll lose enjoyment in a hurry. Be patient. Talk about life, the universe, and everything. Once in a while, your discussion will be punctuated by, "Oooh, did you see that?"
Speaking of falling stars, I went to see Stardust today with adammaker and Jack and a friend of Adam's, and ran into Chris K. at the theater. Oh, my, if you haven't seen it yet and you like fantasy, GO SEE THIS MOVIE! I loved it! Must go see it again.