[HUE]

I think any game or activity that gets them up and moving about would be fun. You can even make sure it somehow reviews language from previous lessons.

Or how about a skit or a play? Hand the students a script from a TV show or movie, which they must then perform (in which case, they could see the real version first). They could even write one based on parameters set up by you (such as a terrible family vacation, or a chance encounter with a movie star). In either case, place the students in groups, hand out a different script or task for each group, and then spend most of the class preparing for it. Then use the last fifteen minutes for the students to perform.