Organizations to volunteer for in Santo Domingo

Hi-I'm headed to Santiago and will find myself in a similar situation. I don't mind being affiliated with religious groups but do want to give back in some form or fashion-not out of wallet though.
What have you found?

Here in Las Terrenas, we've found a few organizations to volunteer with:
- Dogs and Cats of the DR - we've provided transportation for animals, obtained bulk food for them in SD, rounded up beach dogs to send to a sterilization event in Sosua, and spent a weekend supporting a sterilization event here in LT. Once our Spanish reaches a conversational level, we'll also participate in outreach - educating folks in town about the importance of sterilization and proper vet care.
- Biblioteca Anacoana - our little free community library. I volunteer 1-2 shifts each week to help keep the place open and available. We have over 16,000 books in 7 languages.
- A public school that is neglected by the government! We've provided school supplies, but they also have volunteers who cook lunch for the students every day.
- Beach clean-ups! Some of these are organized by non-profits, but others are community events organized by the mayor's office.

One thing you can do is check with local hostels - they are often aware of opportunities for their guests to volunteer in the community!

Thanks!