This song is really easy - the main riff is just: 

G|---------------|---------------|---------------|---------------|
D|---------------|---------------|---------------|---------------|
A|---------------|0-----0--------|2-----0--------|------0-----2--|
E|0-----0--------|---------------|------------3-2|0--------------|
 |1 & 2 & 3 & 4 &|1 & 2 & 3 & 4 &|1 & 2 & 3 & 4 &|1 & 2 & 3 & 4 &|



It get's varied up a bit in the middle:
G|---------------|---------------|---------------|---------------|
D|---------------|---------------|---------------|---------------|
A|---------------|0-----0-----0-1|2-----0--------|------0-----2--|
E|0-----0-------3|---------------|------------3-2|0--------------|
 |1 & 2 & 3 & 4 &|1 & 2 & 3 & 4 &|1 & 2 & 3 & 4 &|1 & 2 & 3 & 4 &|