There's an Eb chord fingerpicked in the background for most of the song, with some variation.
Here's the main idea:
e|--------------|
B|-------4------|
G|-----3---3----|
D|---5-------5--|
A|-6------------|
E|--------------|
[Verse 1]
Eb Cm
We took a flight to the Pacific Northwest
Ab
I've had a longing to go there deep in my chest
Like a dream
[Verse 2]
Eb Cm
Left Portland in the mornin' headed for the coast
Ab
Feels like middle of nowhere, windin' down this road
Ab
And then I see it
This can't be real
[Chorus]
Eb Bb Ab
I've never seen a greener green than that
Eb Bb Ab
The sea salt air I'm breathin' brings life back
Eb Cm
Together, we're alive and free, holdin' hands on the beach
Ab
And I remember what it is to be
Eb Cm Ab
So green
Eb Cm Ab
It was so green
[Verse 3]
Eb Cm
Take a lighthouse tour, we saw the octopus tree
Ab Fm
Feels like some Wes Anderson movie scene
Ab
In the breeze
[Verse 4]
Eb Cm
Made a bonfire on the beach, talked late into the night
Ab Fm
We made love after bottles of cheap red wine
Ab Fm
It was way too sweet (mmm, yeah)
Ab Bb
You taste so swee-eet
[Chorus]
Eb Bb Ab
I've never seen a greener green than that
Eb Bb Ab
The sea salt air I'm breathin' brings life back
Eb Cm
Together, we're alive and free, holdin' hands on the beach
Ab
And I remember what it is to be
Eb Cm Ab Fm
So green
Eb Cm
Yeah, it was so green
[Interlude]
Ab Fm Eb Cm Ab Fm Eb Cm Ab Fm
Yeah-eah-eah-e - a - h, yeah, yeah, oh
[Chorus]
Eb Bb Ab
I've never seen a greener green than that
Eb Bb Ab
The sea salt air I'm breathin' brings life back
Eb Cm
Together, we're alive and free, holdin' hands on the beach
Ab
And I remember what it is to be
You and I rememberin' what it is to be
Eb Cm Ab Bb
So green
Eb Cm Ab
It was so green