Hi Christi!
I am a huge Muppet fan as well - Miss Piggy is my idol! I'm so glad that your son loves Kermit, it seems like most kids these days don't even know who the Muppets are. OK, do I sound like an 80 year old disgruntled woman right now???
Kermit and Miss Piggy sometimes mingle with guests at the entrance to
Muppet Vision 3D. However, I have NEVER seen them out there. I would advise asking the Cast Members that work at the attraction if they know when they may show up. Even if you don't get your own meet and greet, the show is AWESOME. It is definitely on my must-see list and it never seems to get old. The
Stage 1 Company Store, located next door, is a great shop for all Muppet related items.
Oh! I almost forgot a great little secret. Have your son peek under the floor mat, located to the right as you enter the building. A real key is located underneath! Give the fabulous Miss Piggy some "air kisses" for me if you see her!
Much pixie dust,
Jackie S.