Even though El Dorado is filled with splendour and great wealth, Candide and Cacambo leave because Candide wants to go back and pursue Cunegonde. Initially, Baron Thunder Ten-Tronckh, Cunegonde’s father, had walked in on Candide kissing his daughter, an act that he deeply frowned upon especially due to the fact that Candide was a commoner and his daughter a noble. He, therefore, ordered that Candide is ejected from both the castle and Westphalia.

With his newfound wealth, however, Candide is confident that the baron will welcome his advances towards Cunegonde. He, therefore, sets off from El Dorado with over thirty sheep loaded with diamonds, gold, and gems among other gifts. Unfortunately, even after paying for the freedom of the baron, Cunegonde, and the other baron’s relations, the baron is still too proud to allow the union of the two. Candide, determined to tie the knot with his lover, hatches a plan with his advisors to dispose of the baron in Rome after which he and Cunegonde finally marry. The two, much to Candide’s regret, end up living a miserable life.

That's an interesting question. Eldorado was a place where even the mud was made of gold and the stones were jewels. The society is technologically advanced, and the people are peaceful. There are no religious conflicts, and they don't even have a court system because there is no crime. You would think Candide would consider himself in heaven.

However, Candide is in love with Cunegonde. He has vowed to marry her, and so he longs to be with her. Even in a place full of riches, he has nothing because he doesn't have her. So he and Cacambo decide to leave Eldorado--but not without loads of jewels!

Why does Candide decide to leave El Dorado?

El Dorado is a place of bliss and beauty, the one rational place in the world of the story. Candide stumbles upon this magnificent city, where he essentially needn't worry about anything and has wealth, luxury, and provisions as long as he could need them. However, he is heartbroken without his love, Cunegonde, from whom he was separated at the beginning of the story.

He begs the king of El Dorado to allow him to depart so that he can go searching for the woman he loves, but the king counsels him against it. Still, Candide persists, and he is eventually permitted to leave, supplied with vast sums of money and many provisions, which are all very promptly stolen or lost, leaving him once again destitute and having a difficult time finding Cunegonde.