Scott Disick -- Kourtney Kardashian's Baby Daddy Goes South of the Border

Never say Scott Disick isn't well-adjusted ... and the best part -- he can do it all by himself!

Scott was in Mexico recently, hanging with baby mama Kourtney Kardashian, his son Mason and a bunch of friends.

We don't know if Scott went crab diving during the vacation ... but we hear they're in season.