Sand, They Had to Go

"Grandpa, how come the beaches in Hawaii is so different
from the beaches over there where you live in San Diego?"
"Well, my little root beer float...the beaches in San Diego
has dirtier water than Hawaii cuz the fishes in Hawaii don't
make a lot of doo doo and shee shee...compared to mainland.
And the sand in San Diego feels more like dirt cuz no more
sand. That's why they call the place San Diego. It was really
called "Sand, They had to Go" and later it was shortened
to "Sand They Go" and now it's just "San Diego".
"Wow Grandpa, you're the smartest Grandpa in the world."