Surely holidays aren’t for writing? Holidays are for relaxing and doing nothing. For some they are but for others, they’re a time to see sights and enjoy new experiences. This is excellent fodder for stories and articles, as well as fillers and letters. You could just take some notes and photos so you don’t even have to write your piece on holiday; this can all be stored and it’s then ready for you to work on when you’re back home.
On the other hand, perhaps you write best on holiday away from the rush and hassle of everyday life at home. Even if you’re on holiday with family, you can still spend a little time writing, either when everyone else is taking a siesta or if you each have some time to do your own thing.