This a combined list of items that were discussed on the "old" forum
PFD
Spray Skirt
Paddle
Spare Paddle
Paddle Float
Hand Pump
Sponge
Tow Harness
Whistle
Flares
Knife
Spray Jacket
Wet Suit or Dry Suit (depending on water temp)
Cell Phone
VHF Radio
First Aid Kit
Water
Snacks
Hat
Sunglasses
Sunscreen
Bug Spray
Spare Clothes
Dry Bags
Map
Float Plan left with someone
Camera (optional)
GPS (optional)
Spare batteries (optional)
Binoculars (optional)
Two-way Radios (optional)
Compass
Glasses strap, for those of us wearing glasses (or sunglasses)
Watershoes
Map case (to keep map dry)
Emergency gear, including duct tape