hi melanie.
in the past johns has had a big sporting orientation but i think this will change this year as we look to put more emphasis on the whole community/family thing. So really its irrelevant if you've played sport, or if you've done music, community service or whatever, as long as you've been involved and shown that you're willing to participate. at johns it's not so important that you play sport, but rather that you get out and support the teams and show the college spirit that's unique to Johns. what we don't want is people who just sit in their rooms studying all day.
In the interview, they will be impressed if you convey a genuine sense of enthusiasm for the culture and tradition at Johns. I suppose the only other tip i can give is just show them you're a good person- smile, chit-chat and be friendly.
Places to get into Johns are no where near as competitive as people think. I've heard that only 20% of people who bother to show up to the interviews get rejected- so i wouldn't worry too much.
hope this helps.