All of the the common American versions have 'valderi, valdera'; this is the version that was sung by Bing Crosby and others when the song became a hit in 1954. 'Valeri, valdera' also is sung by American Scouts. Happy Wanderer

The Happy Wanderer

I love to go a-wandering,
Along the mountain track,
And as I go, I love to sing,
My knapsack on my back.

Chorus:
Val-deri,Val-dera,
Val-deri,
Val-dera-ha-ha-ha-ha-ha
Val-deri,Val-dera.
My knapsack on my back.

I love to wander by the stream
That dances in the sun,
So joyously it calls to me,
"Come! Join my happy song!"

I wave my hat to all I meet,
And they wave back to me,
And blackbirds call so loud and sweet
From ev'ry green wood tree.

High overhead, the skylarks wing,
They never rest at home
But just like me, they love to sing,
As o'er the world we roam.

Oh, may I go a-wandering
Until the day I die!
Oh, may I always laugh and sing,
Beneath God's clear blue sky!

The old German melody was slightly revised by Henri René and English words were written by Antonia Ridge.
Frank Weir lyrics (also 1954) differ in a word or two; he also used the Henri René arrangement.
In verse two, 'joyously' sometimes appears as 'joyfully.' Anyone have the René - Ridge sheet music?

The DT version differs from the published texts in that in the third verse, a 'bluebird calls,' but in both the Ridge and Weir lyrics, 'blackbirds call.' The 'bluebird' is someone's preference or a mis-hearing.

See the Bing Crosby lyrics here (scroll down): Crosby lyrics