Yep, Old golf cart motor. I live on an urban lake with a bunch of slow 18' pontoon boats. I hooked up a rusty old motor from a golf cart just to see if it would work. It hit almost 5mph! Honestly with some money and time a setup could be made to get the thing on plane and have a little bit of fun. But alas, I have neither the time or money, so out she goes.
Imagine something like this, but on the water.