The Chords to play along with the song go as follows...
Verse and Chorus constantly shift back and forth between the same two chords. Abmaj7 and Dbmaj7. On the Ukulele these chords can actually be voiced quite simply with a great sound.
Here is Abmaj7 (Its just like a G chord moved up the neck one fret)
A----3
E-----4
C----3
G-0
Here is Dbmaj7
A----3
E--1
C--1
G--1
Also, that sweet little riff in the opening of the song goes like this (strum however you feel it)
A-----3-3---------------3-3-----1-3---3
E-----4-4---------------3-3-----------4
C-----3-3---------5-----3-3-----------3
G-0---0-0----0--0--0-1-1-1----1----0-0
The Bridge has the only changes. They go like this.
Db - Eb - Cm7 - Bbm7