There is treasure hidden there, on the coast of California.
El Diego hid it there when The Clara ran aground
On the coast of California, deep within a cave that’s never seen.
Treasure stolen from the Incas, we could capture for the Queen.
There’s a mountain in the ocean on the coast of California
and deep within its side the tides of night alone reveal
El Diego’s hidden cave where we’ll plunder the riches of Granada.
While the Spaniard, blind with pleasure plays ashore in Ensenada.
We will sail before the dawn along the coast of California.
El Diego is delayed. The wine and women hold their sway
And our map is clearly drawn to the dark and stormy shore.
On the coast of California lies a mighty prize of war.
Tell not a soul that you have seen me. Breathe not a word of what I say.
Tell not a soul that you have seen me. Breathe not a word of what I say.
The Coast Road 
Correct, yes, “The South Coast” by The Kingston Trio, locally written (Lillian)?
Lyrics to South Coast :
(Lillian Bos Ross/Sam Eskin/Rich Dehr)
[Chorus:]
South Coast, the wild coast is lonely, you may win at the game at Jolon
But the lion still rules the barrancas and a man there is always alone.
My name is Juan Hano de Castro, my father was a Spanish grandee
But I won my wife in a card game, to hell with the lords o’er the sea
I picked up the ace, I had won her, my heart which was down at my feet
Jumped up to my throat in a hurry, like a warm summer’s day she was sweet
[Chorus]
Her arms had to tighten around me as we rode up the hills from the South
Not a word did I hear from her that day, nor a kiss from her pretty red mouth
We came to my cabin at twilight, the stars twinkled out on the coast
She soon loved the valley, the orchard, but I knew that she loved me the most
[Chorus]
Then I got hurt in a landslide with crushed hip and twice-broken bone
She saddled our pony like lightning, rode off in the night all alone
The lion screamed in the barrancas, the pony fell back on the slide
My young wife lay dead in the moonlight, my heart died that night with my bride
[Chorus]
I think they also did The Wild Coast and Lonely, about the south coast of Big Sur. Great lyrics