My son is turning 6 in a week and we are taking him and 2 of his mates to his fav park. The other thing he wanted to do was go to funstation which are great we just cant afford it atm. :(

I'm not sure what is around you but have you thought of a Bowling Party, Beach Party, Super Hero's theme, Old-School with games like Bob for Apples, sack races etc, Pirate theme, i guess it depends on finances and resources but there are lots of places that cater too.  Like Repitle parties and they bring snakes, lizards etc to your house....now that would be cool!