Before you think I'm nutty for asking for activities for a 1 year old's birthday party, I'll mention that we've invited a few friends with older kids (age ranges from 1.5 years to 7 years). I'm not sure how to keep them entertained. There will be 3 toddlers, 2 pre-school aged kids, and a 6-year old. We have plenty of baby toys, but I don't think they'd be entertaining for the older kids. It's probably going to be crazy hot outside (party is next weekend).
Someone suggested setting up a water activity outside (water table? small splash pool?) and letting some of the kids play out there. Does this sound like a good idea or a parent's nightmare? If we do this, I'd contact the other parents ahead of time so they can bring swim gear and anything else they might want.
Any other ideas? Our backyard is very small, on a hill, and there's basically no flat space with grass - we have a small patio and the rest of the space is landscaped.
We have a Wii - what's the age minimum for entertainment with that?
Any other ideas? I'm grasping at straws here!