I’m wholly unqualified to speak intelligently about instrumental music, but this certainly strikes me as a lovely piece of work that captures the spirit of Pet Sounds (on which it’s the sixth track).
I will leave further commentary to the song’s composer, Brian Wilson:
“The most satisfying piece of music I’ve ever made. I applied a certain set of dynamics through the arrangement and the mixing and got a full musical extension of what I’d planned during the earliest stages of the theme. I think the chord changes are very special. I used a lot of musicians on the track; twelve violins, piano, four saxes, oboe, vibes, a guitar with a coke bottle on the strings for a semi-steel guitar effect. Also, I used two basses and percussion. The total effect is Let’s Go Away For Awhile, which is something everyone in the world must have said at some time or another. Nice thought; most of us don’t go away, but it’s still a nice thought.”