Limnos 4, also known simply as Lymnos, was a leisure planet active during the 23rd century. Its facilities were state-of-the-art in contemporary entertainments and methods of relaxation, offering non-gravity swimming pools, sleep-reading stations, accelerated learning experiences that covered every subject of the Technic Index, and robotic gladiatorial games. (TV: The Leisure Hive)
The Second Doctor once took Jamie and Zoe to the chill out zone on Lymnos. He tried to explain the concept of relaxation to Zoe, but she couldn't get into it. (PROSE: Big Bang Generation)