You'd be surprised how something as simple as Bingo can energize a boring unit. The great thing about this is that it is so modular. You can use this with just about any Shakespearean tragedy, and you could even adapt it to fit whatever play you are working through. I have kids fill mark their bingo on one side and write what it is they found and a citation on the blank side.
Make it leveled: You can also give an additional prize for a "blackout" to up the ante.