sometimes play Riff 2
Riff 2
G|-------------|
D|-------------|
A|-------------|
E|-8-----7---|
When the the drums do their thing alternate between Riff 1 and 2. then just play:
Riff 3
G|-----------|
D|-----------|
A|-----------|
E|-3---1---|
Go back to playing the Riff 1 and Riff 2 pattern. The second time he says "cool as ice cream" play:
Riff 4
G|--------------------------|
D|--------------------------|
A|--8--7--5--------------|
E|---------------8---7----|
then alternate between Riff 1 and Riff 3 the your out when it's quiet and come in with Riff 3 when it's loud then play this to the end.
Riff 5
G|--------------------------|
D|--------------------------|
A|--3----2----------------|
E|-------------5-----3----|