This sometimes happens accidentally if an expensive trip has already been booked but can happen deliberately if people genuinely want to discuss things in a relaxed and neutral space.
Breakations are effective because of the chance to communicate openly, appreciate each-other, celebrate the joys of the relationship and drink heavily without affecting your job.
There is a high chance of sexual intimacy and breakation sex can be phenomenal but should cease before the end of the vacation so that the party that least desires the break-up gets the message.
Having sex with others on a breakation is not cool.
Honey, I want to make this trip a breakation.
A: What about the money we already spent on that vacation? We can't get it back.
B: I still want to go
A: I still want to go too
B: It'll be our breakation