Re: kayak setup
Might I suggest a Camelback system for water/beverage of choice. It eliminates the need for a cooler, unless you bring snacks. But I have a lot of little things on my kayak that just make things easier, without being in the way. I have some Velcro superglued to the side, not the underside, that I use to hold my rod out of the way when Im paddling. I have a very basic kayak I bought from Dick's on sale for like $150 bucks so the seat needed work too. I can vouch for the rod leash, I had a friend tip in some rapids, and lost his setup, at like the halfway point of the float...not fun! What helps with storage to, is wearing a vest, I always bring my fishing vest, keeps the kayak empty.
The more you fish from a kayak, the more ideas you will get on how to streamline the process. Every time I go, I think of something new.