In my spare time, I´m helping out a bit with another project, San Fracisco Saludable. They run a basic but very clever waste management system here. There are trash recepticles on nearly every block which are gathered every week day. The bags are split into organic, recyclable and inservicable, which greatly reduces the work required to properly dispose of them. The organic waste is composted and used in a garden. At the moment there´s no way of recycling anything, because there are no facilities close enough, so the recyclables are stored until further notice, while the rest is burned or burried.
They also helped set up a garden at the local primary school, to help the kids learn about gardening and medicinal plants. Most of my involvement is just helping around both of the gardens, though my ability to use a computer has come in handy as well.
SFS could always use more volunteers, and they have a few rooms complete with loving family that people can stay in. So if you feel like a jungle vacation/learning/loving experience, just hit them up and say you know me. They also love donations, which will mostly go towards buying supplies and paying the salaries of the locals it employs.