I think it'll help you. Interviewers (and admissions committees) like to see people with outside interests. Also, if you're taking a gap year, being a science teacher is a great activity/well-paid job. I was a fine arts major, and am taking a year off to teach chemistry and live my life before med school right now.
There's a lot of hype and talk about the kinds of things you 'need' to do or be to get into med school (bio major, hospital volunteer, pre-med society, etc.), and none of that is really true. It's your life! Major in whatever you want, as long as those prereq's get finished, you're good. The happier and more fulfilled you are when you apply, the better you'll do on the interviews as well.