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 (x02210@1)                     DLet's (xx0232@1)pretend that it's summer
C (x32010@1)                BAnd (x2444x@1)a bright sunny day
Am (x02210@1)                  DAnd (xx0232@1)we're feeling so happy
C (x32010@1)                      E'Cause (022100@1)the clouds went away
Am (x02210@1)              DAs (xx0232@1)we run by the sea side
C (x32010@1)                 BHeading (x2444x@1)down to the bay
Am (x02210@1)              DLooking (xx0232@1)over the water
C (x32010@1)                EI (022100@1)can hear myself say

       DLet's (xx0232@1)laugh
      GHave (320003@1)fun
        AWe'll (x02220@1)smile
     GAnd (320003@1)run
       DWe'll (xx0232@1)live
        GFor (320003@1)a while
          AFeeling (x02220@1)free
         GWith (320003@1)a smile

Am (x02210@1)                   DNow (xx0232@1)you're feeling so happy
C (x32010@1)                      B'Cause (x2444x@1)the breeze went away
Am (x02210@1)                DAnd (xx0232@1)it's lasting forever
C (x32010@1)                 ESo (022100@1)we're happy to play

       DWe'll (xx0232@1)laugh
       GWe'll (320003@1)run
          AFeeling (x02220@1)free
       GBeing (320003@1)fun
         DWith (xx0232@1)a smile
        GFor (320003@1)a while
          AFeeling (x02220@1)free
         GLike (320003@1)a child

Am (x02210@1)                DI (xx0232@1)feel nothing but good vibes
C (x32010@1)                   BAnd (x2444x@1)it's lasting all day
Am (x02210@1)                  DGoing (xx0232@1)now 'cause I'm so high
C (x32010@1)                     EAnd (022100@1)that's how I will stay

       DWe'll (xx0232@1)laugh
       GWe'll (320003@1)run
          AFeeling (x02220@1)free
          GLike (320003@1)the sun
         DWell (xx0232@1)I fly
            GThrough (320003@1)the air
          AFeeling (x02220@1)free
         GLike (320003@1)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