Volunteers (1985 Nicholas Meyer)

Cheerful nonsense in which Tom Hanks (in one of his first films, effortlessly smooth) finds himself in the Peace Corps in  Thailand (Mexico, with imported animals), accompanied by John Candy and Rita Wilson. They got together during the shooting (Tom was in fact still married) and that's the kind of background info I really like:

“Rita and I just looked at each other and — kaboing — that was that. I asked Rita if it was the real thing for her, and it just couldn't be denied.”

With shades of Bridge on the River Kwai and Casablanca it bundles along briskly like an efficient mother in Sainsburys.