I dunno...but would you really WANT to bring it into the park?? LOL...like we dont have ENOUGH to carry around!!
For my daughters bday...we had it at the hotel when we were done with the parks
If you mean a regular size cake with icing and all that - Don't know, really. Can't imagine why not. But I don't know what you'd use to cut it with, because you couldn't bring a knife in.