I’ve stepped up from my first float tube, which was a truck tire inner tube to which I lashed a boat’s throwable float cushion for a seat. Ouch. My current model isn’t a doughnut, but a U-shaped tube for much easier entry and exit, and the ends of the “U” serve as tiny outriggers, dampening the back-and-forth rocking motion that results from flycasting. I strongly suggest not only a set of fins, but a set of float-tube-specific fins, which are made to fit over stockingfoot waders or bare feet. Mine have a slight uplift at the toe, which helps in walking, but I still turn around and trudge backwards to get to the water.