Christopher Columbus lived for another 14 years after setting foot in the Americas. In that time he undoubtedly did many things.

He completed his first voyage touching on Cuba, Hispaniola and various other Caribbean Islands. He completed 3 more voyages to the Americas (or "Indies", in his opinion) (reaching the mainland on his third voyage). He was governor of the Spanish Indies for a while. He wrote two books.

Columbus undoubtedly did a lot of other more mundane things as well.