Zoo Keeper:
I'd have a big rectangular "zoo" made out of drop targets. You'd have to bust them all out to start the zoo jailbreak, just like in the game. (Like, knocking the drop target walls down starts a 10 ball multiball, or something equally dumb and loud).
Elevator Action:
Re-Themed Pinball Circus.
Frogger:
Mini playfield at the top with 5 captive scoops, just like in the video game. Get your frog (the ball) to safety.