First Birthday Party Ideas?

Seriously, what? It's a month away, but I'm freaking out because the stuff I want to do is not really possible. She'll be the smallest (and youngest) child at her own party and I don't think it's fair to rent a slip-n-slide or bouncy castle if she can't participate. What I'm trying to organize here is a 2-hour playdate that happens to have cake, ice cream, and pizza. We're putting "no gifts" on the invitations to reinforce the idea. I just don't want the kids to get bored.