Planning Graig's 1st Birthday

I am sitting here having a meltdown trying to figure out where to throw my sons 1st birthday party! I wanted to do a pavilion at a park near my house and they're booked for the whole summer on weekends. I'm getting a little stressed. And all the places I could go like those bouncy places or a childrens museum.. don't let you decorate and it's only for an hour or so. I want a themed party with decorations =(. I need ideas!