What is the Spanish meaning of viva Las Vegas?

Answer 1

The literal translation is: Alive (in) The Meadows.

Viva = Alive
Las (or Los) = The
Vega = Meadow (s for plural)

The area where the city of Las Vegas was eventually built, carried that name prior to becoming a city; and was so named due to it's plentiful underground water supply and fertile ground; it was quite literally a huge fertile meadow surrounded by desert.

'Viva Las Vegas' translates literally as: 'Alive The Meadows'; but is meant to imply: "(I am) alive (and playing in) the meadows".