Without further ado:
1. Water Sports Lighted Bocce Ball Set, $49.99. Probably more suitable for rafters than kayakers, due to size constraints. But perfect for nighttime entertainment.
3. 14mm Wide Angle or Fisheye Lens, $200-350. If you've got a DSLR, you will kick yourself if you don't bring your wide angle on this trip. There are so many gorgeous shots in the Grand, like this one:
Even if you're not going to take night shots, your landscapes will be infinitely more beautiful when you can capture the whole scene. This photo is great:
For Canon full-frame: Rokinon FE14M-C 14mm F2.8 Ultra Wide Lens for Canon
For Nikon full-frame: Rokinon 14mm f/2.8 IF ED UMC Ultra Wide Angle Fixed Lens w/ Built-in AE Chip
For Canon, Nikon or Pentax crop sensor: Rokinon HD8M-C 8mm f/3.5 HD Fisheye Lens with Removeable Hood
4. Gorilla Tape, $8.47. This is more of an essential than a non-essential if you're doing a self-support kayak trip. If your kayak cracks, you can use Gorilla Tape for a makeshift repair.
5. SeaSpecs Extreme Sports Sunglasses, $24.95. These glasses are designed for kiteboarding, surfing, jetskiing, windsurfing, snowboarding and other extreme sports. I've only ever used them for whitewater kayaking... but for me, eye protection is important enough that I almost didn't want to include SeaSpecs on a non-essential list. I sincerely don't understand how other kayakers can kayak without eye protection.
However, if you're only going to bring ONE book on your trip, it should probably be Colorado River in the Grand Canyon RiverMap Guide.Or, if you've got space for a larger, more detailed guide, order a copy of Belknap's Waterproof Grand Canyon Guide - All New Edition, which provides detailed information about each rapid and is better for a self-support trip.
Rafters and kayakers: What are some of your favorite nonessential items for kayak camping or multi-day rafting trips? Share in the comments!