The Three Princes Plaque was designed by Tom Ralston Concrete and Sean Monaghan of the Bronze Works. The plaque was to commemorate the first time anyone rode waves with a surfboard on Mainland USA. The Hawaiian Princes rode the Santa Cruz Rivermouth with large redwood boards made from indigenous Santa Cruz redwood trees at a local Santa Cruz mill. Tom Ralston Concrete was recognized by the State Assembly and is also in the Mayor's Proclamation for Three Hawaiian Princes Day on every April 9th from 2010 forward.
