Translation of fruitless in Spanish

You're from USA right?! You are learning German too? Why? Do you want to go to Germany? I'm from Italy and I used to live in Portugal for a while. Now I'm learning in order not to forget everything I learned there. Are you working?
We were not the only tourists, there were a many boats sailing on the same route. At one point the driver stopped the boat and immediately children of the village people approached us.
At Pisac we visited its 'once certainly authentic', 'today completely touristic' market. We enjoyed it anyway, ate fresh corncobs and bought a warm wool hat.