When we speak of Vrndavana, it is not imagination. In the sastra, there is description, how Krsna is there, what He is doing. Especially it is mentioned, surabhir abhipalayantam. Krsna has got this hobby. Just like our hobby — dog-abhipalayantam. We keep, every one of us, especially in the Western countries, a dog. So why not Krsna keeping so many cows? What is the difficulty for Him? So He intentionally becomes a cowherd boy. That is His pleasure.
From Srila Prabhupada’s lecture on Srimad-Bhagavatam 6.1.41 — June 7, 1976, Los Angeles