Why X essay in 150 words?

How should I approach a why X college essay, given just 150 words? I understand the general idea of writing “why x” essays with more words, but I’m struggling with coming up with such a short response. Should I be focusing on just a single program/extracurricular and go deeply into that, or talk about multiple things at the school that interest me (with less elaboration)?

An interesting thing I heard during an information session at Dickinson is to focus less on what the school does/offers and more yourself at the school- what can you do for the school?
Just food for thought. Write what you want to write, then cut it down.