A few good articles to read and consider the options available.

I'll be looking into the income  based repayment plan this coming week. I hope it is an easy process like they say. I"ll let you know the out come. 

Here are a few good articles to read. 

COLUMN-Five ways do-gooders can erase student-loan debt

http://www.reuters.com/article/2013/12/30/column-weston-debt-idUSL2N0K21HV20131230

If your student loan debt is high relative to your income, you may qualify for the Income-Based Repayment Plan (IBR).

http://studentaid.ed.gov/repay-loans/understand/plans/income-based

From the little bit I read already you do end up paying more interest on the loans because you are making smaller payments for a period of time. So that is something to consider. 

Also not all volunteer opportunities will be eligible for earning money toward your loans. So do your research before considering this option. But its is something to consider if you can do it.