What makes El Dorado such a utopia?

In Chapter
XVII of 's famous ,and his servant Cacambo, in desperate straits, reach Eldorado where they are
amazed at the riches, as well as the cultivation of the country for both utility and aesthetic
pleasure.  As they enter a village, the two men notice children playing
quoits happily, using balls of gold and precious gems as carelessly as if they were
stones.  At a resplendent house, they smell delicious cooking and hear delightful music.  When
Cacambo approaches the house and hears his native tongue spoken, he tells Candide that he will
be his interpreter.  They are graciously invited to have dinner...