The lake can't stop us from entering El Dorado. What kind of adventurers and wisdom-seekers would we be? One of the books at the library said only a golden sacrifice can open the gates of the city. Do you think a ritual of throwing gold into the lake might work?
Get all the gold nuggets...
...and place them on the bridges:
A path to the underground has opened. You need to get through the labyrinth and find 6 levers that open a bridge:
Once you find a lever, please pull it:
If you pull all 6 levers, please return to Ernesto and enter the entrance to El Dorado: