A.O.
I think parks are wonderful for parties. You'd be amazed how much a group of kids can enjoy playing on playground equipment together, not to mention games on the grass. Ring around the Rosie, Simon Says, Hot Potato, etc. are easy park games. It's nice b/c you leave the park behind and don't have to deal with clean up at home! Also, fresh air is underrated. One year olds don't need a lot of entertainment or extras; they are pretty content just to toddle around checking things and each other out.