Maybe try asking questions about their Creative Writing/English department, about how its resources can help you succeed. I don't know anything about their program, but maybe, using what you know about them, you could ask how they've connected students with publishing opportunities in the past, what kinds of opportunities there are for TA-ships (even if you're not actually interested), etc.
I'm imagining it's like those questions at the end of a job interview, in the sense that if you express your familiarity with details of the program, and show concern over how those resources can aid your success, you'll demonstrate your ambition and also the fact that you care enough about their program to know its specifics.
Sorry if this is poor/obvious advice, but hey I tried! ^^;