Translation of frivolity in Spanish

We drove to the airport to do early check-in but it went so quickly that we had four hours left before our flight departed. We therefore took a cab back into town and visited the local market.
Why do you wanna learn to speak Portuguese, it's a very difficult language? I don't know many people who can speak well, except Portuguese and Brazilians of course. I love the sound of it.
The next day we decided to spend on the other side of the mountain range (antiplano), in Bolivia. We didn't have the courage to drive deep into Bolivia, as everyone told us about the bad infrastructure and condition there.