things to bring hiking
For obvious reasons a camera is really nice to bring along. Big plus if it's a digital camera! Other items: a whistle, in case you get lost or need help ; waterproof matches ; some kind of lip balm/blistex ; sunglasses ; extra batteries for that flashlight! gaiters are great if you're hiking in shorts and it's a bushy or wet trail
You should bring one even if you don't plan on wearing it. Parka/Raincoat Hikes will never be planned in the rain since it really is no fun to hike in bad weather. Since the weather is very unpredictable it is best if everyone brings rain gear. Toilet Paper. Generally a bathroom will be available at the base of a mountain as well as at an AMC cabin on the mountain.
Also avoid snacks with a lot of salt as salt makes you thirsty. Good alternatives to trail mix are crackers, potato sticks, grapes or raisins. Plan on having something to snack on every couple of hours on a long day hike to keep your energy level up.
TIP: keep an extra pair in your pack in case your feet (or your buddy's!) get wet, and on a longer hike change your socks at the top - you will be much more comfortable on the way down. Poly or silk sock liners are also a great treat on those longer hikes to help prevent friction burns (aka blisters!).