I'm not sure I can add more than what birchbarkcanoe has said - that's some sound advice.

-this may go without saying - but please let some one you know where you're going specifically and what your rough schedule is. Search and rescue sucks... it sucks worse when some one "went hiking up the canyon over there".

-bring something to do. Are you going alone? with a friend? with a group? A deck of cards can be a sanity saver. A harmonica maybe? a good book? all are light weight and can really help salve the lonely mind. but not a kindle or a iPod or a smartphone...

-Toilet Paper. Dude... I've forgotten this before... and it makes for a miserable time.

-Can't stress enough the advice you've already gotten on cotton. Gotta keep dry. gotta. polypro stuff can be had CHEAP at places like marshals and TJ maxX. It's not the high end REI stuff - but some cheap reebok or nike reject workout shirt that is 100% poly will be like $8. So, so, so important - especially back east. I've not hiked the apple-atchas, but you're gonna get wet - even if just sweaty - and you're going to want to wick that away. Socks too - do what you can to get your hands on some good socks. buy the cheap, ugly shirt... buy the AWESOME SOCKS.

-bug spray. DEET is your friend. look for the small bottle of 100% deet. It's usually a bit more money - but it goes a long way and isn't watered down. It's light weight and does the job. You might also consider a bug net hat. Nothing bugs me more than mosquitos on my face/neck.

-food: as previously mentioned - dried stuff is your friend. My method: put each serving in a ziplock bag. You can boil the water on your stove and then just poor it in. the bag makes for no cleanup (other than rolling it up and putting it in your garbage bag). No dishes to do! One of my favorites is dried mashed potatoes and a cut up, pre-cooked hotdog or sausage. Add some seasoning, and boom - you get a flavorful, carb and protein packed meal that weighs almost nothing - and depending on the choice of meat - will last several days. Heck - you could probably even do some tofu.

-Cheap-ish work gloves. They come in SO handy for handling hot stuff or unpleasant stuff. You may want to ditch them in favor of weight or space - but I love having them. For me - they're worth the ounces.

-Sandals or other lightweight camp shoes. When you roll in to camp at night - it's great to give your feet a break. be safe though.

-Paracord or rope. Unless you're climbing, you won't need a ton - but 50' of cord is super handy to have around for a makeshift shelters, hanging your bag, drying clothes, tent repair, etc.

if any or all of this is too "preachy" or "yah, yah - I've heard this all before" I apologize.

I'm jealous. Just thinking about this stuff makes me giddy for you. I hope you'll give us a trip report.