I have enjoyed the use until recently of a rotomold top-sitter surf version, which I just heist up on my existing Toyota roof rack and strap down.
I would take it out at sunrise on the still waters of La Jolla, when the sea-birds were still dozing in rafts floating together. I have met several dolphins this way, as well as long distance swimmers of the human variety. For reasons I don't understand the birds and dolphins always seemed more exciting.