The triplets sat back-to-back-to-back on the bench.
Wait! How? It’s a bench. Wouldn’t they be side-by-side?
I think it depends on the bench. On this circular model, you can sit with your back to others on the bench and all enjoy the tree’s shade. (Okay, considering the size of the trunk, the tree may not produce a lot of shade — yet. Return in five years.)
You can choose your view. Small lake with ducks and fishermen? Walkers starting or ending a circuit of the lake? Parking lot to catalog new arrivals?
Located in suburban St. Louis, this would be a great place for the characters in COMFORT ZONE to enjoy a walk and casual conversation. Kindle: https://amzn.to/2ZvL0Av