Here are some things you will want to bring. Some are obviously very optional (bird guides) and some are pretty important (sleeping bag, clothes). This list isn't meant to be exhaustive; it's meant to get you started thinking about what you'd like to have at camp:

• Camping gear--tent, sleeping pad, sleeping bag, extra blanket
• Food--Small soft-sided, 6-pack sized coolers are best when using bear boxes. Otherwise, bring whatever you want. We suggest easy breakfasts (oatmeal, cereal, fruit etc.) and no-cook lunches so you can take them on hikes with you (e.g cheese and crackers, bars, trail mix, apples). Some folks cook "big" for dinner, others add water to mac-n-cheese and call it a night. :) You may want to bring coffee or tea.
• Toiletries--you will need less of these than you think! Put things in little bottles. If you are not past getting your period, bring tampons or pads, regardless of where you are on your cycle. Trust us on this one.
• Kitchen gear: pot/pan/silverware/utensils/plate/bowl/cup, sponge, dishtowel, paper towels/napkins, salt & pepper.
• Campstove if you have one. If you have a stove and are willing to share, great. We ask that those without stoves to bring some propane (the usual Coleman canisters work for many stoves and are easy to find).  It looks like this: http://tinyurl.com/nzrvnc
• Bottle or two for water
• Towel for drying off after washing up or swimming, washcloth for washing up
• Swimsuit, water shoes or flip flops if you are going to swim
• Sunglasses and strap
• Earplugs (just in case)
• Clothes--hiking clothes, lounging around camp clothes, sleeping clothes. Toss in a hat for sun. Socks, underwear etc. obviously.
• Outer clothes--It can get mighty chilly at night at elevation, so if you are doing one of the "high country" CampOUTs like Yosemite or Loon Lake, bring a jacket or a couple of fleece, a hat, some gloves.
• Shoes--something sturdy for hiking, something for walking around camp, flip flops or water shoes. 
• Flashlight, lantern or headlamp with batteries. You'll want something electric you can put in your tent or use when you are out after dark.
• Sunblock and insect repellent
• Bandana (works for a lot of stuff--if you have one, toss it in)
• Basic first aid kit--something for blisters/small cuts (for when you are hiking)
• Any RX or over-the-counter medications you need
• Chair for sitting around the fire
• Daypack--what you'd ordinarily carry on a day hike
• Camera (note: there's no place to charge batteries etc.)
• Other rec gear: bikes, kayaks etc. Bring a lock.
• Rain jacket (just in case)
• You may want to bring a whistle to toss into your pack for hiking
• Hiking poles (if you use them)
• If you have a map, compass, GPS or other such navigation tools, you may want to bring them
• Guides: birds, flowers, natural history of the area etc.
• Binoculars
• Your sense of adventure