Harbor, exactly---towing something behind during slow ride (sitting on knees) sounds like a good idea. Somebody was towing behind standup something ? how it went ?
For spearfishing I got everything needed - speargun, gloves, fins, socks, gloves, line, float...in general I would be happy to catch 1-2 fish and then go back. Of course I need tow it, but what I saw, it was behind standard sit jetski...