bench

One of several benches spaced out along the Seaport boardwalk.

Royal Park

A bench, a tree, and a flood retention wall pretending to be bleachers.

Royal Park  is a remnant of the early attempts to dredge the Tamar basin - basically, the whole thing is an accumulation of dumped river silt. The original shoreline (or what passed for it, given it was probably semi-tidal wetlands) was about another 50 metres further on from the concrete wall in background.