I dont remember much at all about this movie, was something i caught on TV once (definitely a movie). Maybe made in the 70s or 80s.
All i remember is one scene where a girl is wearing just yellow bikini bottoms and standing on a pier or dock or something similar talking to an older guy. Theres an older larger lady in the water at points learning to swim (badly).
Long shot but hopefulky it rings some bells
Just a guess – “Blame It on Rio”?
https://en.wikipedia.org/wiki/Blame_It_on_Rio
sadly not 🙁 just checked it out and not the one i’m thinking of