We went to Pirates in December and enjopyed this. As usual don't rely on the food to fill you up, but it wasn't too bad. There is also a disco afterwards. This would probably depend on the gender of your children, if you have a majority of girls it may not be so good.
You should have seen my face when my 7 year old son started singing along to 'what shall we do with the drunken sailor'. Apparently he had learnt the song at school.