* Tourism: This is the most common and general abstract noun, referring to the activity of traveling for pleasure.
* Travel: A broader term encompassing all forms of travel, including tourism.
* Sightseeing: Specifically refers to the act of visiting places of interest.
* Exploration: Emphasizes the act of discovering and experiencing new places.
* Wanderlust: A more poetic term for the desire to travel.
The best choice depends on the specific meaning you want to convey.