In some ways it is best to bring as little as possible to the river. There are however, some essential personal items that you may need.

Light weight clothing that will dry quickly, eg. shorts, t-shirt, swim wear for on the river.
Warm clothing for the evenings including a fleece or a pullover.
Sunscreen and lip protector.
Sunglasses (with retaining device) and/or a cap.
Towel.
Toiletries (environmentally friendly is best!) and any personal medication.
Flashlight.
Footwear that will stay on in the river, ‘Tevas’ or tennis shoes are best.

You may also want to consider bringing:
Camera, spare film and batteries
Walkman/Discman
Spare glasses/contact lenses
A book to read
Your diary and a pen!
Snack treats/cigarettes
A small amount of money
A positive attitude!