This is an easy way to play if it kills me, I've never written tab before so be patient, 
I know this isn't how Mraz plays it but it is the easiest way enjoy,

feel free to leave comments


e---2---------------3-|
b---3-----------------|
G---2------1----------|
D---------------------|
A------------------2--|
E------------------3--|


chorus

e---2-------2-----2-----3 the 222--| thing is laying first finger across strings at 2nd fret
b---3-------2-----2/3--------------|
G---2------2-----2-----------------|
D------------------4---------------|
A----------4-------------2---------|
E-------------------------3--------|

the run that leads out of the chorus is


A---0/ 1 so open A then fret A string 1st fret
E---3

then

e---
b---1
G---
D---2
A---3
E---


then the whole thing repeats

the 2/3 thing= still laying finger across the three strings at 2nd fret but also with 
finger fretting b string 3rd fret