I have really enjoyed playing Kingdom Come: Deliverance, which is semi-open world (and a lot smaller in geographic scale) which also has a lot of horse riding as well as a good story. It’s worth a play as well, though I understand RDR2 far outweighs it in scope.
Is it necessary to play RDR1 before starting RDR2? Is anything missed?
"I saw this in a cartoon once, but I'm pretty sure I can do it..."