The United Nations classified three forms of tourism in 1994 in its Recommendations on Tourism Statistics: Domestic tourism, which involves residents of the given country traveling only within this country; Inbound tourism, involving non-residents traveling in the given country; and Outbound tourism, involving residents traveling in another country.

The hospitality industry is a 3.5 trillion dollar service sector within the global economy. It is an umbrella term for a broad variety of service industries including, but not limited to, hotels , food service , casinos , and tourism . The hospitality industry is very diverse and global. The industry is cyclical ; dictated by the fluctuations that occur with an economy every year.

Creative tourism has existed as a form of cultural tourism since the early beginnings of tourism itself.

Meanwhile, the concept of creative tourism has been picked up by high-profile organizations such as UNESCO , who through the Creative Cities Network have endorsed creative tourism as an engaged, authentic experience that promotes an active understanding of the specific cultural features of a place

Rural Tourism has focus on participating in rural lifestyle.

Literary tourism is a type of cultural tourism that deals with places and events from fictional texts as well as the lives of their authors. This could include following the route a fictional character charts in a novel, visiting particular settings from a story or tracking down the haunts of a novelist.

Literary tourists are specifically interested in how places have influenced writing and at the same time how writing has created place. In order to become a literary tourist you only need a novel and an inquisitive mind-set; however, there are literary guides, literary maps, and literary tours to help you on your way.

Ecotourism includes programs that minimize the negative aspects of conventional tourism on the environment and enhance the cultural integrity of local people. Therefore, in addition to evaluating environmental and cultural factors, an integral part of ecotourism is the promotion of recycling, energy efficiency, water conservation, and creation of economic opportunities for the local communities. ^[1]

Sustainable tourism is a form of tourism that follows the principles of sustainability .

Sustainable tourism in its purest sense, is an industry committed to making a low impact on the natural environment and local culture , while helping to generate income and employment for locals. ^[1]

            ^ " Urban Environmental Management Sustainable Tourism ". Global Development Research Center.

Geo tourism http://www.nationalgeographic.com/travel/sustainable/about_geotourism.html

Geotourism adds to sustainability principles by building on geographical character-"sense of place"-to create a type of tourism that emphasizes the distinctiveness of its locale, and that benefits visitor and resident alike.

Geotourism is defined as tourism that sustains or enhances the geographical character of a place-its environment, culture, aesthetics, heritage, and the well-being of its residents.

Adventure travel is a type of tourism involving exploration or travel to remote, exotic and possibly hostile areas, where the traveler should "expect the unexpected".           

Adventure tourism gains much of its excitement by allowing its participants to step outside of their comfort zone. This may be from experiencing culture shock, or through the performance of acts that require significant effort and involve some degree of risk (real or perceived) and/or physical danger. This may include activities such as mountaineering, trekking, bungee jumping, mountain biking, rafting ,zip-lining and rock climbing.     

Adventure recreation refers to active and outdoor activities such as backpacking (wilderness), rafting, climbing, and outdoor survival.

Agritourism is a style of vacation that normally takes place on a farm. This may include the chance to help with farming tasks during the visit. Agritourism is often practiced in wine growing regions in Michigan, California, Italy and Spain. In America, Agritourism is wide-spread and includes any farm open to the public at least part of the year. Tourists can pick fruits and vegetables, ride horses, taste honey, learn about wine, shop in farm gift shops and farm stands for local and regional produce or hand-crafted gifts, and much more.           

Wine tourism refers to tourism whose purpose is or includes the tasting, consumption, or purchase of wine, often at or near the source. Wine tourism can consist of visits to wineries, vineyards, and restaurants known to offer unique vintages, as well as organized wine tours, wine festivals, or other special events.

A staycation (or stay-cation, or stacation) is a period of time in which an individual or family stays at home and relaxes at home or takes day trips from their home to area attractions. Staycations have achieved high popularity in current hard economic times in which unemployment levels and gas prices are high ^{[1] [2]} .

Volunteer vacations are vacations which include some activities focused on furthering a charitable cause for which the participant receives no remuneration.

The types of volunteer vacations are diverse, from low-skill work cleaning up local wildlife areas to providing high-skill medical aid in a foreign country.

Medical tourism (also called medical travel, health tourism or global healthcare) is a term initially coined by travel agencies and the mass media to describe the rapidly-growing practice of traveling across international borders to obtain health care.          

A forecast by Deloitte Consulting published in August 2008 projected that medical tourism originating in the US could jump by a factor of ten over the next decade. An estimated 750,000 Americans went abroad for health care in 2007, and the report estimated that a million and a half would seek health care outside the US in 2008. The growth in medical tourism has the potential to cost US health care providers billions of dollars in lost revenue. ^[5]                

Dental tourism is a subset of the sector known as medical tourism . It involves individuals seeking dental care outside of their local healthcare systems.

Source:  http://en.wikipedia.org/wiki/Tourism