Buffalo Audubon (Relax at the cabin while the kids enjoy their camp—such a wonderful experience!)
Park School (especially Earth Spirit during summer scholars!). Also the best school in Buffalo in our highly biased opinion - PreK to 12th!
Reinstein Woods. Best deal in town paired with amazing nature education in a beautiful, accessible, welcoming outdoor space.
Hog Island Camp - opportunities for families, teens, and grown ups!
Junior Master Herpetologist Program - not birds but lots of overlap of interest for many young birders :)