My son who is turning 5 in May wants a "superman" party (surprise surprise

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Anyway, his birthday falls right in time for my dh to leave for Iraq so we decided to make it a big BASH (unfortunately). At the same time it will be fun to have all the kiddos there and the couples come out too. So I rented a pavillian at the local park and have thought up a few games to play for kids young and old (oldest being 7)
Here is my thought and you all tell me if I am crazy!
I want to do all the "old fashioned' type stuff: sack races, egg/spoon races, egg toss, etc. For the egg toss I was thinking I could decorate each of the eggs with a superman logo on the front and then maybe affix a cape to the back of it (kinda like a superhero cape). Cute idea right? Ok, so NOW how do I do this? How do I make the capes? How do I attach them? (hot glue)
My other idea, I want all the kids to have a superhero cape, to wear at the party and to take home.....do you know where I could find a pattern to make these? would it be super easy to do? (I am obviously hiring someone to do this!!)
and lastly, what other super hero game could I incorporate? I was thinking of doing a treasure hunt where the teams of people would go looking for clues and who ever solves the mystery wins.....so would that be enough? (sack races, egg and spoon race, kite flying, egg toss, treasure hunt, and moon bouncer)