I awoke this morning with this song dancing in my head. After struggling for half the day, trying to remember in which movie it was sung, I was rewarded on finding this forum. Only one thing... I could have sworn that part of the lyrics went:

We're on our way (we're on our way)
Pack up your pack (pack up your pack)
And if we stay (and if we stay)
And we won't be back (we won't be back)
For many a day (for many a day)

Thanks for clearing it up.

But please, to clarify it in my mind... at the end of the movie, did Judy and her friends sing "Cuanto le Gusta" and dance down the middle of the street, away from the camera? That's how I remember its ending.