Check out my video at http://www.youtube.com/watch?v=WD_Iycp0bHg to see the strum 
pattern and the pace of the song =)

Capo 5

Intro:  G Em Cadd9 Em D C Em D G

   G            
I come home in the morning light
   Em
My mother says, "when you gonna live your life right?"
   Cadd9
Oh mother dear, we're not the fortunate ones
   Em            D      C
But girls, they wanna have fun
   Em            D      C
Oh girls, just wanna have fun


 G 
The phone rings in the middle of the night
    Em
My father yells, "what you gonna do with your life?"
    Cadd9
Oh, daddy dear, you know you're still number one
    Em            D       C
But girls, they wanna have fun
    Em           D      G
Oh girls just wanna have...

  G
That's all they really wa-a-a-a-a-ant,
  Em
Some fun,
  G
When the working day is done,
  Em              D        C       Em
Oh girls, they wanna have fun, oh girls
      D      C
Just wanna have fun


Instrumental:   G Em Cadd9 Em D C Em D G

(strum a bit faster for this next part)

    G                                Em                                     
Some boys take a beautiful girl and hide her away from the rest of the world
   Cadd9 
I wanna be the one to walk in the sun
  Em             D       C
But girls, they wanna have fun
  Em           D
Girls just wanna have...
  G
Thats all they really want
  Em
Some fun
  G
When the working day is done
  Em               D       C
Oh girls, they wanna have fun
  Em            D           G*
Oh girls just wanna have fun.

* = only strum once