Adjectival tourism is the numerous niche or specialty travel forms of tourism; each with its own adjective.
Examples of the more common niche tourism markets include: https://web.archive.org/web/20150621054037/http://cultural-heritage-tourism.com/what-are-adjectival-specialty-niche-tourisms/ http://travelgeography.blogspot.com/2017/02/adjectival-specialty-niche-conceptual.html