Obstacle Course- depending on ages, kids hopped over the pool noodles...
crawled through the tunnel (or through a hula hoop)...
and rode a pony (or ran) to the finish line! Most kids were young enough that they only did one step of the obstacle course at a time.
Arts & Crafts- paint in a bag, one of my personal favorites.
Music- we just had a nice donation of new instruments, which everybody loved banging on, honking, and strumming.
Popsicle Stick Picture Frames- we took pictures on our photo booth computer and decorated classic popsicle stick picture frame. I did find that kids were less interested in this part (which I somewhat expected) so it was nice having the music station in the same room.
And swimming! Only one little girl went all the way in, but all the kids liked splashing in the kiddie pool.