Here are the next photos from Album 1. Could this next image also be from Red Bridge Park? It doesn’t have any writing on the back unfortunately:
Photo 18
The next image is a funny one, with the two women posed among the reeds:
Photo 19
This photo doesn’t have any writing on the back either. I think I recognize the girl who featured in many of the earlier photos on the right with the bow on the side of her head.
Bayside Blog 
I’m wondering…if “S” is September, then what are “RB” and “C”?
Yes, and why are two different years written on that second photo. It has me stymied!