I was at a beach this week in which social distancing seemed to work. The park managers had put red cones along the water front, in a single line, with probably about 30' between them. You had to set your chairs, towels, etc. at one of the cones. From the cone, you could walk straight to the water, and play or swim in the space directly in front of your cone.
It worked really well. There was no need to walk through anyone else's space. Even little kids could figure it out. When there were no cones left, then no more folks were allowed on the beach. It was a large beach, and not all the cones were filled, so I don't think anyone was turned away.
Ya, everyone's just trying to figure it out and keep traffic in popular beach areas.
Wasaga Beach installs ‘pods’ to help visitors avoid crowding