The boulders namesake crack. This is a stellar crack climb that is perfect for beginners, boulderers that want to give that crazy crack climbing a try, and crusty old guys alike. Tons of fun, you can run laps on this all day and not get bored. Has good feet options for the first half, if you don't feel like jamming your feet in the crack as well.
The hardest part is definitely at the top. It's fairly tall, so bring a pad and possibly a spotter.
Obvious crack in the middle of the east face. If you don't see it, you're at the wrong rock.