Dow Chemical Company has a wetlands preserve on it's property right on the Pittsburgh-Antioch border. It's not very well known as the more publicly owned wetlands around the San Francisco Bay but it has good Yelp reviews and a nice observation deck and pathway
Hiking Angel Island
Some of the best views of San Francisco Bay are right in the middle of the bay on Angel island State Park
garbage ringing the San Francisco Bay after storms
The San Francisco Chronicle reported on some rare fossil finds as a result of the recent storms around San Francisco, but there's a darker side and that is the sheer amount of garbage and trash that is now ringing the San Francisco Bay like a giant bathtub ring. This is on the Bay Trail just north of the San Francisco airport and in an environmentally sensitive area