Great song... As all BJM's songs. Listened to it and looked for a tab in ma laziness...
find it so I had to tab it... Here it is, I'm almost sure it's all okay, maybe the DGAG
are a bit off, but I think the chords are right, even if it may sound a bit weird 
of the bass and the piano playin an F#m instead of the first D... I think so at least.
anyway, here it is, have fun:

Am                       D
Let's pretend that it's summer
C                  B
And a bright sunny day
Am                    D
And we're feeling so happy
C                        E
'Cause the clouds went away
Am                D
As we run by the sea side
C                   B
Heading down to the bay
Am                D
Looking over the water
C                  E
I can hear myself say

       D
Let's laugh
      G
Have fun
        A
We'll smile
     G
And run
       D
We'll live
        G
For a while
          A
Feeling free
         G
With a smile

Am                     D
Now you're feeling so happy
C                        B
'Cause the breeze went away
Am                  D
And it's lasting forever
C                   E
So we're happy to play

       D
We'll laugh
       G
We'll run
          A
Feeling free
       G
Being fun
         D
With a smile
        G
For a while
          A
Feeling free
         G
Like a child

Am                  D
I feel nothing but good vibes
C                     B
And it's lasting all day
Am                    D
Going now 'cause I'm so high
C                       E
And that's how I will stay

       D
We'll laugh
       G
We'll run
          A
Feeling free
          G
Like the sun
         D
Well I fly
            G
Through the air
          A
Feeling free
         G
Like my hair


Additional: Basic bass lines

A|-----------5~--------------------|
E|-5-7-8-7-5----5---8--8-8-10-8-7~-|

A|-----------5~-----7--7-7-5---7~------|
E|-5-7-8-7-5----5------------8---------|

E|-2...-3...-5...-3...-| x2