Intro: (Acoustic Ska - Upstroke on offbeats, mute all 6 strings with your palm 
on the down)

The verses just go G-D, like


G      D        G        D         G
  It's soon but I've set sail again

G   D          G          D
The wind feels right this time

    G         D              G       D           G
the waves are small but they rock my boat just enough

G    D        G        D    G
It's soon but I've set sail again




Chorus:

G    D      Em   C     G    D      Em        C
  If you get    seasick I'll drop anchor and hold you close

G    D      Em  C     G    D           Em          C         G
  If you get   sunstroke I'll let you sleep in the hold of my boat


Then some more of the G D action next verse.  pretty simple.