I think there's probably far too many to crown any one of them the best. I guess there might be a handful that define an era, or some other aspect that makes them that bit more than others too
Slow down, you move too fast
You got to make the morning last
Just kicking down the cobblestones
Looking for fun and feeling groovy
Ba da-da da-da da-da, feeling groovy
Hello lamppost, what'cha knowing
I've come to watch your flowers growin'
Ain't you got no rhymes for me?
Doo-ait-n-doo-doo, feeling groovy
Ba da-da da-da da-da, feeling groovy
I got no deeds to do, no promises to keep
I'm dappled and drowsy and ready to sleep
Let the morningtime drop all its petals on me
Life, I love you, all is groovy