See the Port 'A' Sandcastle Guy on Concierge.com
The castle in the picture was really a creation by Amazn Walter and Christy Clown

The Corpus Christi Caller Times Interview "Work is a Day at the Beach"
The video interview

The Sandcastle Guy in the Tulsa World: "Sand man carves life on the beach"
 

The Austin Statesman: Sand contests

San Antonio Express: "Building castle of sand pancakes"