Go through their immense archives and collections. You'd need multiple lifetimes to get through it all.

Turn the whole place into a skate park worthy of being a level on Tony Hawk Pro Skater for Playstation.

Well I'm about to be a pain in their asses on the topic of queer liberation.

Well, fortunately, I already know Latin.

Hang all the pedos. There'll be a lot of swinging dicks.

Spend forever staring at (maybe even touch) the art.

And

Investigate if they really do have an assassin group.

Mentally ramble to myself every time I hear them chitchatting, on how their Latin sounds broken. (Ecclesiastical Latin tilts my brain into misinterpreting it as Italian.)

…can I drink their booze and read their books? If yes, I'd probably be doing that.

Probably hang out with Father Robert and the Vaticats

Focus on my pasta cooking skills and take them to a legendary level.

I fail to see the difficulty in this.