Your family can visit either the Franklin Park Zoo in Boston or the Stone Zoo in Stoneham with these 4 passes. 

The Franklin Park Zoo has animals from the following areas: Serengeti Crossing, Children's Zoo, Franklin Farm, Giraffe Savannah, Outback Trail, Tropical Forest and Bird's World.  The Stone Zoo has animals in the following areas: Yukon Creek, Windows to the Wild, Treasures of the Sierra Madre, Barnyard, and Himalayan Highlands.