The phrase "nice distraction" refers to something that takes your attention away from a problem or a task for a short while, and makes you feel better or happier.
Sentences with «nice distraction»
Listening to them talk was a very nice distraction from the discomfort of my contractions. (birthwithoutfearblog.com)
There is a whole host of side missions which are excellent and offer a very nice distraction from the main game. (plusxp.com)
They're short, fun in small doses, and nice distractions from the usual Super Mario gameplay. (brutalgamer.com)