Ramones and others do the cover of this song.
This is the true song by rivieras. 
They haven't an official website.

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Title     : California Sun
Artist    : The Rivieras
Album     : 
Capo      : I fret
Setting   : E-A-D-G-B-E
Tabbed by : Don D (thunderstruck_666@hotmail.com)
Date      : 18/04/2007
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__________________________________________________________________________________
Capo!!: 1st fret!!! The name of the chords indicate only the position of the hand!
Ex. Capo 1st fret, position hand for D but the chord you're going to play is a D#
__________________________________________________________________________________

FIGURE A
|---------------------8-8-11----|
|-----8--11-11--11-11--------11-|
|-8-8---------------------------|
|-------------------------------|
|-------------------------------|
|-------------------------------|

|-11------8--------|
|----11-8---11-8---|
|----------------8-|
|------------------|
|------------------|
|------------------| <---I think this is a little bit wrong. But it's not important.

     D G 
     D G 
     D G 
     D G 
     D B 
     G A D
    

     Well, I'm goin' out west where I belong  (Figure A)
     Where the days are short and the nights are long (Figure A)
     
                D             G
     Where they walk and I'll walk
          D              G     
     They twist and I'll twist
          D               G  
     They shimmy and I'll shimmy
          D            G
     They fly and I'll fly
                  D                 B
     Well they're out there a'havin fun
             G        A      D  
     In that warm California sun.
     
     Well, I'm goin out west out on the coast (Figure A)
     Where the California girls are really the most (Figure A)
     
          D             G
     Where they walk and I'll walk
          D              G     
     They twist and I'll twist
          D               G  
     They shimmy and I'll shimmy
          D            G
     They fly and I'll fly
                  D                 B
     Well they're out there a'havin fun
             G        A      D  
     In that warm California sun.
     

     D D 

     D G 
     D G 
     D G 
     D G 
     D B 
     G A D

    
     
     Well the girls are frisky in old Frisco (Figure A)
     A pretty little chick wherever you go (Figure A)   
     
                     D             G
     A-a-and they'll walk and I'll walk
          D              G     
     They twist and I'll twist
          D               G  
     They shimmy and I'll shimmy
          D            G
     They fly and I'll fly
                  D                 B
     Well they're out there a'havin fun
             G        A      D  
     In that warm California sun.
                                    B
     Yeah they're out there a'havin fun
             G        A      D     
     In that warm California sun