Theresreally only two, the on played for pretty much the whole song (including chorus 
and verse) and the one played after he says "quicksand"
you'll have to tune the whole guitar down to a D.

------------------------------1----------
-----------0------0------0------0---0----
--------0------2-------2----2-----2------
------2------0-------3-------------------
-h2h3------------------------------------


Second Riff
  Part A                Part B
-----------------|---------2--------------
---------1-------|-----3-------3----------
-----0-------0---|---2---2---2---2--------
---2---2---2---2-|-0----------------------
-3---------------|------------------------
-----------------|------------------------
        This part goes like A,A,B,A,B,A,B,B
On your last time of playing B, play this;
------------2--
------3-----3--
----2---2---2--
--0---------0--
---------------
---------------

It's a really easy song to play, its based on the chords; C,G,Esus2, and D but for a 
tuned down guitar.