I bought a piece of 1.5 inch stiff foam to try to fix a sag in a bed. It didn’t work but having that thick piece of solid foam around has been a life saver.
Need something flat to put a laptop on? Throw it on the foam. Going to be doing something that requires you to be on your knees for a while? Get the foam!
It went from stupid purchase to something I’d gladly replace if it broke.
We have that one as well (also replaced the paddles) and my friends tried it out and liked it so much they bought their own. They went with Sevylor backpack kayaks though. They’re a little bulky, but still let them bike to the boathouse to meet us.