Would you recommend WTA - Maryland?
Lou August runs WTA. He's friendly and there's plenty of work to do. If you have spare time usually saturdays, a reliable ride, and a charitable spirit it's a good experience.
I'd highly recommend volunteering at WTA to tech savvy high school juniors and seniors looking for Student Service Learning hours.
The work is not hard just time consuming, so pay attention to directions and it should be a breeze.
The only thing to look out for is your own expectations, WTA is temporarily being run from Lou's garage as WTA because they're in the middle of moving across the US. Also WTA has close ties to a homeless shelter in DC, so you could end up going there on a saturday. Don't expect anything fancy.
If nothing so far has been a deal breaker and you live close enough to Layhill or DC, get into contact with Lou, he's pretty enthusiastic.
He has cats at his house so don't go there if you have pet allergies.