A holiday, or a vacation, was an excursion to a location for leisure.
The Fourth Doctor intended to go on a "nice, long holiday" with K9 Mark II to Halergan 3 before being interrupted by the White Guardian. (TV: The Ribos Operation)
When the Sixth Doctor announced to Peri that the TARDIS suddenly had no faults and that he didn't know what to do with himself, Peri convinced him to take a holiday. The Doctor at first objected, saying that "Time Lords don't take holidays", but ultimately took to the idea, selecting Tranquela as their destination. (AUDIO: The Ultimate Evil)
Before travelling with the Tenth Doctor, Donna Noble only ever had package holidays. (TV: Planet of the Ood)
The Eleventh Doctor promised to take Clara Oswald on a "proper holiday", only for him to wipe his memory while tampering with the telepathic circuits. After Clara helped him restore it via the Twelve Hundred Year Diary, the two went off on their holiday. (TV: The History of the Doctor)
The Twelfth Doctor and Clara Oswald were attempting to go on a vacation when the TARDIS was pulled off course by Ethel. (COMIC: A Stitch in Time)
Xandra Lenea-Ashford went on holiday in 2003. (PROSE: Have You Seen This Man?)
When speaking with Lindy Pepper-Bean for the first time as a new follower through the social media service known as the Bubble, Suzie Pentecost noted that it was quiet in Finetime and asked if "they" had declared a holiday, not realizing that her fellow Finetime residents were being consumed by Mantraps and that she was next. (TV: Dot and Bubble)