I'm not a huge Jimmy Buffet fan, but I stumbled across the music video for this song recently, and it stuck with me as something that could be a fun one-shot RP.Jimmy Buffett - Who's The Blonde Stranger?
TLDW: A couple goes on vacation to some tropical resort (the song has Texas, but it could easily be the Carribean or Hawaii). The wife is laid up with sunburn, the husband goes out wandering, and ends up cheating on her with a hot blonde. Simultaneously, though, his wife happens to cheat on him with another man at the resort. In the end, they both go home pretending nothing happened, and pretending they didn't know the other was up to something.
The way I see this working is a little odd, but could be fun…I’d be playing both men, and need someone to play both of the women, so that the two sub-stories 'end' together. Anyone interested?