Translation of ecological in Spanish

One hour later people were starting to leave and we did not exactly understand why. We took another drink and I paid the bar man cash. Later it turned out that the change he gave me would be fake money.
Well I take Spanish classes in college, that's the only useful language they offer, but if they had French I would be taking French. It sounds so nice. I have been lazy lately and I'm not really good at it.
At the third or fourth guesthouse we finally took a room. Of course the hot water would not work, and luckily we were upgraded to a terrific, huge room with balcony and garden. It was a very charming place.