T.M.
My sister-in-law had a pirate party for my 4 year old niece. She used this website to get her ideas from. They also have a lot more ideas for other types of birthday parties for children. I am using it to help plan my nephew's 6th birthday party. It is Super hero Themed. They have a lot of great ideas.
http://www.coolest-kid-birthday-parties.com/pirate-birthd...
My sister-in-law also went to Long John Silvers, if you have one near by, and she asked them for some hats. They gave her free hats for the kids and some toys to give away!
Hope this helps!