Kursaal

 was a Class Two leisure world, owned and developed by the Gray Corporation. It contained a huge theme park. Kursaal was located in the Cronus System, and was previously known as Saturnia Regina before the Gray Corporation bought it.

The Doctor took Sam Jones there on one occasion in order to give her a luxurious holiday. He enticed her to go by having her "imagine Disneyland meets Babylon 5. (EDA: Kursaal)
 * The name "Kursaal" essentially refers to two things: the planet, and the theme park development on that planet.