Black and red balloons in every corner I could cram balloons.
Bowls and vases full of sand and seashells and pirate "treasure" on every surface.
Chocolate coins and gold beads everywhere.
And of course a tricked-out pirate ship cake.
For activities we played musical islands in the backyard (like musical chairs, but with "islands" cut out of brown paper) with a pirate sword prize for the winner and everyone decorated their own "pirate chest" to take home.
The pirate pinata to finish the afternoon was filled with chocolate coin "treasure."
At the end of the day the kids left with lots of pirate swag: the hats and beads, the treasure chests they made themselves, pirate stickers and pirate tattoos and a king's ransom in chocolate coin "treasure" in their piratey loot bags.