I created the skyline out of poster board from the Dollar Tree as well. I used my square punch for all the windows. Some of the buildings I used extra foam core pieces to create a bit of dimension, I just hot glued a few squares stacked on top of each other then glued it to the buildings.
I created the clouds to help hide the line from where the wrapping paper overlapped. And then cut some stars and a giant “Super K” search light. This cost me all of $12 to make.
We had Ka-Boom Punch which was really just blue Hawaiian Punch. And Invisible Water.
We also did water balloons, and the kids played in the sprinklers to cool off. I forgot to take pictures (bah!) but I also had black balloons that I put a piece of double bubble inside of each balloon and blew up to look like small black bombs. The kids were allowed to pop two balloons each.
I also bought a couple rolls of tin foil and made a ton of tin foil balls, then spray painted them lightly with some old green paint I had on hand to create Kriptonite! They raced to see who could throw more Kriptonite in to the bucket in the time allowed. They ended up just throwing this at each other afterwards which kept them busy for a while.