Just because the boy's birthday party is taking place at an old prison, that doesn't mean it can't be festive! Cover the picnic table with a bright blue tablecloth.
Serve the sandwiches and salad on sports-themed plates with matching sports napkins. Green cups and orange plastic silverware are colorful accents.
Pack the food in take-out containers and place the containers in portable coolers. Bring a bunch of water guns, and let the boys run around Alcatraz playing with them. Stretch lizards are a simple but fun party favor.