Water proof bags such as dry bags. You will need these to keep your clothes, food, first aid kit high and dry. Try to limit your clothing. Don't take a whole week of clothing...you will most likely not change often. After the first two days...what's the point??? Take sturdy hiking shoes if you are going to do any hiking and there is ample opportunity for this. Be sure to include a hat (one that you can secure to your head). One of our party lost his and had to wear a t-shirt around his head. It gets very hot and you need that hat! YOu probably will be in a bathing suit most of the time, but will want a change of clothing when you take out..it will be more comfortable when riding back in the jet boat. A GOOD FIRST AID KIT...ESSENTIAL!!! A knife, signal mirror or device, water purification kit (just in case you didn't listen to me about the water :),) guidebooks, a good map of the river, SUNSCREEN, SUNSCREEN, SUNSCREEN, sunglasses, personal hygiene items. Lots of film, extra batteries (remember - there is no electricity after you get on the river - unless you have a contract with the electricity god! Tent - if you want to sleep with no fear of bugs. We didn't use a tent until the last night (it was just too beautiful sleeping under the stars), sleeping bag, pillow, towels. Do not bring your whole kitchen. Try to limit your cooking equipment. We made a lot of one-pot meals. Make your evening meal as hearty as you can because YOU WILL BE HUNGRY! Spare paddle (every boat should have one!!), extra water if you can squeeze it in...do I sound like a broken record here? lol. Something to bail water with, a big natural sponge (great for soaking up water in the bottom of the canoe. Make sure EVERYTHING IS TIED ON.