Either Strum or play in the same pattern as the intro throughout, obviously 
without the strum at the end.
Either Standard Tuning or Capo on 1 if playing it like the intro
Also keep your 3rd and fourth finger on like this:
E----3---|
B----3---|
G--------|
D--------|
C--------|
E--------|
for everything except the chorus, but still keep it on the Em7 chord for the 
chorus, hope that made sense :)

Intro:
E-----------------------------------------------|
B-----------3-----------------3-----------3-----|
G--------0-----0-----------0-----0--------0-----|
D-----2-----------2-----2-----------2-----2-----|
C--3-----------------3-----------------3--3--3--|
E-----------------------------------------------|

Verse 1
C                Em7 
I spent my time, watching
     G                              C
The spaces that have grown between us.
                      Em7
And I cut my mind on second best,
       G                               C   
Oh the scars that come with the greenness.
                          Em7
And I gave my eyes to the boredom,
           G                      C
Still the seabed wouldn't let me in.
                                 Em7
And I try my best to embrace the darkness
G          C
In which I swim.

C                           Em7
Now walking back, down this mountain,
    G                       C     
The strength of a turnin' tide.
                            Em7
Oh the wind so soft, and my skin,
         G                    C
Yeah the sun so hot upon my side.
                       Em7
Oh lookin' out at this happiness
   G                          C
I searched for between the sheets,
                       Em7
Oh feelin' blind, but realize,
G                           C     
All I was searchin' for... was me.
   Em7    G                  C      
Oh oh-oh, all I was searchin' for was me.
D
Oh yeah

Em7                D               C
keep your head up, keep your heart strong no, no, no, no,
Em7                 D              C 
keep your mind set, keep your hair long Oh my, my darlin'.
Em7                D               C
keep your head up, keep your heart strong Na, oh, no, no.
Em7                D                               C
keep your mind set in your ways.... Keep your heart strong.

VERSE 2 
C                          Em7
Now I saw a friend of mine, the other day,
       G                               C
And he told me that my eyes were gleamin'.
                                Em7
Oh I said I'd been away, and he knew
      G                       C
Oh he knew the depths I was meanin'.
                       Em7
And it felt so good to see his face,
        G                         C
All the comfort invested in my soul,
                              Em7
Oh to feel the warmth, of his smile,
            G                  C
'said, 'I'm happy to have you home.'
Em7          G                  C
Oh oh-oh, I'm happy to have you home.
D
Ohh

CHORUS 

Em7                D               C
keep your head up, keep your heart strong no, no, no, no,
Em7                 D              C 
keep your mind set, keep your hair long Oh my, my darlin'.
Em7                D               C
keep your head up, keep your heart strong Na, oh, no, no.
Em7                D                                C
keep your mind set in your ways.... Keep your heart strong.


BRIDGE

Em7                D               C
'Cause I'll always remember you the same.
Em7                D               C
Oh eyes like wildflowers, oh with your demons of change.

D                                C 
Ohhh May you find happiness here.
D                                         C
Ohhh May all your hopes all turn out right.

CHORUS

Em7                D               C
keep your head up, keep your heart strong no, no, no, no,
Em7                 D              C 
keep your mind set, keep your hair long Oh my, my darlin'.
Em7                D               C
keep your head up, keep your heart strong Na, oh, no, no.
Em7                D                                C
keep your mind set in your ways.... Keep your heart strong.

OUTRO

Em7                D               C
'Cause I'll always remember you the same.
Em7                D               C
Oh eyes like wildflowers, oh with your demons of change.

Sorry if it's not great, it is my first tab :/