What type of tourism is characterized by outdoor activities and natural environments?

Adventure tourism is characterized by outdoor activities and the exploration of natural environments, making it a perfect fit for this question. This type of tourism typically involves physical activities such as hiking, climbing, biking, or kayaking, which not only provide an adrenaline rush but also allow tourists to engage closely with nature. The focus on adventure often implies a certain level of risk and excitement, with travelers seeking unique experiences that challenge them physically and mentally in natural settings.

While ecotourism also includes outdoor activities and a connection to nature, it primarily emphasizes responsible travel and the conservation of natural resources. Ecotourism is oriented towards sustainability and the protection of ecosystems rather than thrill-seeking adventures. Cultural tourism is focused on experiencing the cultural heritage of a location, including traditions, customs, and historical experiences, rather than outdoor physical activities. Mass tourism refers to a large number of tourists visiting the same location and often involves standardized experiences rather than the unique and personalized experiences associated with adventure tourism.

Thus, adventure tourism is the most fitting answer for the type of tourism that emphasizes outdoor activities and natural environments.