This is my first tab, but I'm fairly certain this is accurate, because it's a
beautifully simple song.
So at the beginning and a few times throughout the song, he does these little "dum
dummmm , dum dummmm , dum dummmm , dum dum dum dum" and there is only a slight variation in what
you play. So you play the G, C, D progression for the first bit, then at the last four 
hums he does a quick picking part and this is the tab for that:
E--------------- | 
A--------------- | 
D--------------- | 
G---7---7--5---- | 
B-----5--------- | 
e--------------- | 

Enjoy!

G5 , C5 , D5 picking(tab above) (x2)

G5          C5
If I had a jet pack,
     D5
I'd circle into space,
     G5                   C5
with roller-blades on my feet
    D5
and pencils in my hands.

     G5             C5
But skating on the moon
    D5
is better in the morning,
    G5      C5
and I feel better when
D5
I am drawing

       G5              C5
So I'll draw myself a picture
   D5
a rainbow tailed dinosaur
        G5             C5
and I'll put him in a bowl
    D5
and fill the bowl with milk

G5            C5
suddenly everything
      D5
seems so much calmer
G5           C5
cats wearing bow ties
D5
having tea with a llama

seems great

G5 , C5 , D5 picking(tab above) (x2)

   G5               C5
and even though I'm running late
   D5
to such a rad party
   G5            C5
I don't seem to mind that
    D5
it's already started.

   G5            C5
My attire isn't fitting
  D5
I think there was a theme
  G5                        C5
I must have misplaced the invitation
     D5
that explained everything

     G5            C5
so I fire up the jet-pack
    D5
and head back home
     G5               C5
but when I arrive to my dismay
D5
all my friends have gone

     G5            C5
oh no I think to myself
     D5
I'll draw up some more
    G5                 C5
but all my pencils are broken
       D5
and I left my paper on the moon

what a disaster

G5 , C5 , D5 picking(tab above) (x4)