Check your local Sierra Club. They should have a group call the ICO which focuses on taking kids who have little or no chance to do outdoors activities like hiking and camping etc. They also do environmental education. I work w/ the STL chapter and have taken my kid and others on trips, combining leadership w/ family and service. Also look to see if there is a local Black Girls Do Bike and GirlTrek in your area. We have an active chapter of BGDB and GirlTrek here. BGDB is self-explanatory while GirlTrek is more hiking focused.