20 lines from current Spanish songs for your students to translate. I like playing the songs for them afterward. I've picked lyrics that are grammatically important and not naughty (though other lyrics in the entire song might be).
Example of one lyric excerpt:
3. Pero tras la tormenta, solo espero que el sol venga. Quiero bailar hasta el amanecer. (Un mes, Mara)
Add your own instructions: I suggest "Translate these lyrics," or additionally, "Circle all the preterite verbs" "Highlight the commands" /etc.