Hiya, I've also been thinking about doing a pirate themed meeting, there's so much you can do with that theme!
You could play Lighthouses: for this you just need a torch and a blindfold.
One girl sits at one end of the hall blindfolded. She is the lighthouse and has to try and shine her torch on the incoming guides. The lighthouse cannot move the torch when it is turned on, so she has to hear the person, aim, then turn on the light.
The lights are turned off so you can see the beam of light and who was touched by it, then all the other guides (the boats) have to try and silently get past the lighthouse without her shining the torch onto them. You can send one girl at a time, but usually we end up sending three or four at once.
Once a girl has got caught she has been "sunk" so she has to sit down exactly where she is, which also creates more debris in the way of later ships. You can also start off with chairs in the way too, so it's not a straightforward walk. Another way to make it more fun is to have two lighthouses down the end (two girls, two torches)