Wish I could tell you who all the kids are, but I think it's a great shot. I have always loved the Buffalo Zoo, and it's neat to see previous generations enjoying it too!
In Buffalo, Kleinhans means two things: The Buffalo Philharmonic and fine men's clothing. This receipt for my great-grandfather is obviously from the latter.
I've always had this photo in with the other Adirondacks pictures, but now I'm not so sure it's from the same time. That's my grampa in the front, lying down, but he looks younger and is wearing a different shirt. The knickers in the back make me think it's the 30's. Perhaps it is. In any case, I have to admire them for hiking up the mountain in dress socks and regular shoes.
Icouldn't tell you who these folks are, but I imagine they are friends or relatives of my grandfather. My great-grampa Kelly is on the trip, so they may be from that side too.
By the way, the Adirondacks is what "Upstate" means to me.