my son had a pirate party (but he is 4) I made a hook to fit on the chidlren's hands (well half a plastic container - abit like a soft yoghurt pot and put one of those candy canes like you have at Christmas on the end) let them hook those pretzel/biscuits with holes in them with it. Was surprised how many they got and how they didn't get upset. Perhaps you could adapt in some way?
or walk the plank blindfolded but you'd need cushions - we played outside (also with cushions)