Strange. I distinctly recall finding the lyrics somewhere on the Web, but now I'm unable to find that page. Heh, I love the 'El Rio Del Tiempo' theme, and I had always wanted to learn its lyrics. Fortunately, I also acquired the tune off alt.binaries.multimedia.disney, so here they are. This is only the English version, of course, as I wouldn't be able to transcribe the Spanish verses.
Welcome, mis amigos, to friendly Mexico,
To the land of fiestas -- they're everywhere you go.
Listen to marimbas and mariachis, too,
Playing latin rhythms and serenading you.
Come join the crowd.
The music's good and loud,
The air is full of song,
so come and sing along,
be-cause in Mexico,
When people smile at you,
There's just one thing to do:
You join the fiesta too!
Hola, mis amigos, it's fiesta time for you.
In [??] and in Tampico too.
[Not sure about this line.]
Swing in Acapulco with everyone you meet.
Join in the fun.
It's here for everyone.
[I can't clearly hear the rest of this verse.]
So long, happy people, we hate to see you go.
Hurry back, amigos, to friendly Mexico.
Come on back to [??], to Acapulco, too,
Pretty senoritas and charros wait for you.
We'll meet again
In Tropical Cancun,
In lovely Mazitan,
Or maybe in [??],
Be-cause in Mexico
When folks meet now and then
We never say "goodbye;"
It's "'til we meet again!"