I thought it was Australia? Oh ... that was Support Your Local Sherrif, and there is a lot of that character in James Garner's performance in this film.
Garner looks a bit heavier and a bit slower in this film, as the injuries he'd suffered in previous roles started to catch up to him. This was just before Rockford, where he often moved like an old man because of them.
This is a great fish out of water film, and the novelty is it works both ways. Garner's Costain, rescued after he escaped from a ship that shanghaied him, finds himself totally out of place among the native Hawaiians, and on a potato farm.
Once Mrs. MacAvoy (Vera Miles) learns she might leverage some wild cattle into saving her failing farm, she convinces Costain to retrain her farm hands as cowboys. That's the second fish out of water element, because the Hawaiians initially don't fare too well as cowpokes. :-)
But with training mishaps, witch doctoring, and having to figure out how to load cattle on ships with no docks available, Costain almost gives up.
Garner is always a good watch. I've never been disappointed.