That reminds me...
While we were out there we were staying at what basically amounted to floating cabins just off shore. At the end of the day the fish you caught would be cleaned and there was a huge amount of blood / guts / etc washed into the ocean. Of course this amounted to a huge feeding frenzy by the mackeral (???, unsure of exact species) that had taken up residence since they knew about the daily 'feeding' schedule.
We didn't have our fly rods, but there was a small spinning outfit for the guests use. We tied on a jighead and a small piece of plastic to give it some action in the water and would be hitting these fiesty 12" - 14" fish for as long as we wanted to. They were actually fairly good fights for their size, and by the end of the trip we'd decided that if we were ever back this way we'd bring the heavier fly rods for the bigger fish as well as the smaller weight rod to add a little fun to the end of the day dock fishing.
I'd imagine a 3-wt or 4-wt rod would be great for something like that, and chances are you could probably easily get away with using any trout flies / streamers you had, so no need to pick up any extra flies for catching fishermen.