Treasure hunts are a great way to get your hands on a lot of cash in Red Dead Redemption 2 without getting your hands near as dirty as you would pulling off a robbery. Each treasure hunt rewards a certain number of gold bars, which can be sold at the camp or to a fence for cold hard cash, so tracking down each clue can quickly add up to a big chunk of change.
Source: N4G PC Red Dead Redemption 2: How to find every secret treasure hunt