I'm pretty sure this is right except for a couple notes here and there.
I've looked all over for a bass tab for this song and I couldn't find one anywhere, so here it is: 


verse-repeats many times throughout the song
G  :-------------------------------------------------|
D  :-------------------2-3-2-------------------------|
A  :--5--0-3-5-5-5---0---------1-1-------1-----------|
E  :-------------------------1-----1-1-1---1-1-1-----|


part at the end of the verse
G  :-----------0-0-0-3-3-8-0--------------------------------------------
D  :-----1-1-1---------------1----------------------8-------------------
A  :--------------------------------9-9-8-9-9-11-11---11-9-9-9----------
E  :--------------------------------------------------------------------

G  :-7-7---7-----------|
D  :-----7---7-0-2-----|
A  :---------------0---|
E  :-------------------|

"Think of all the good times..."
G  :--------------------------------------------------------------------|
D  :-----3-3-3----------3-3-3----------------------5-5-5---------------5|
A  :-----------3-3------------3-3--------------5-5-------5-5-------5-5--|
E  :---------------1--1-----------1--1---3-3-3---------------3-3-3------|



G  :--------------------------------------------------------------------|
D  :5-5-----------------------------------------------------------------|
A  :----5-5-------------------------------------------------------------|
E  :--------------5---5-5-5--5-5-6--6-6-6--6-6-5--5-5-5--5-5-6--6-6-6--5|


Break-the timing is tricky here
G  :--------------------------------------------------------------------|
D  :--------------------------------------------------------------------|
A  :----0-3-5------0-3-5-------1-1---------1-1---------------0-3-5------|
E  :-------------------------1-----------1------------------------------|

G  :--------------------------------------------|
D  :--------------------------------------------|
A  :0-3-5--------1--1---------1-----1-----------|
E  :-----------1-----------1-----1--------------|

played at about 3:15 in the song
G  :-----------------------------------------|
D  :-----------------------------------------|
A  :-6~-------------9~-----------/13-11-9-4-5|
E  :-----------------------------------------|
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