Over the years, it has grown into a full-fledged casino resort that offers gaming, entertainment, and dining options to visitors from all over California and beyond. Sycuan Casino Resort opened for business on March 27, 1983, as a small bingo hall with just a few hundred seats. If you’re wondering when Sycuan Casino Resort first opened its doors, you’ve come to the right place. Sycuan Casino Resort is one of the most popular destinations for gaming enthusiasts in San Diego County.