I will go to the bank by the wood and become undisguised and naked,
I am mad for it to be in contact with me.
Walt is saying that he wants to return to nature in a spiritual sense through a physical means. To Walt, clothes are a disguise of who people really are in their natural, unadorned state. He’s going down to the river and getting naked so he can go for a swim, because he longs to be completely submerged in nature.
Compare the lyrics to Stan Rogers' “Forty-Five Years,” describing skinny-dipping in Nova Scotia:
Where the earth shows its bones of wind-broken stone
And the sea and the sky are one
I’m caught out of time, my blood sings with wine
And I’m running naked in the sun
There’s God in the trees, I’m weak in the knees
And the sky is a painful blue
I’d like to look around, but honey, all I see is you
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