Masters in Public Health - Just beginning to consider - what should I shoot for?

I wasn’t considering grad school until this year (might’ve tried harder to up my GPA had I known). So, any advice you can offer would be really helpful.

Anyway, I’m looking in Colorado and California as I have connections in those states that would make the move easier. I’ve yet to take the GRE but obviously will soon. I’m applying to be an Americorps VISTA for the coming year. I would like to begin school in Fall 2017. I’m not aiming for UCLA or anything, but I am looking for a quality program (looking at Sociocultural Diversity at UCI and Community and Behavioral Health at CU Anschutz)… Are these schools realistic for someone finding interest so late? For them to be realistic, what score should I aim for on the GRE?

I’m looking to volunteer a bunch and gain research experience so any tips would be great. As I said, I’m just starting here! Thanks in advance!

BA in Sociology - 3.4 GPA (2015)