sunjinghong
Tourism 是个可数名词，旅游的意思a tourism 一次旅游。同时也表示旅游业。Travel 作为名词旅游的时候不可数，同时也有漫游的意思。作为动词旅游的时候，既可作为及物动词也可作为不及物动词。tour trip journey都是可数名词。具体使用哪个要看语境。你要把这个词放在什么样的环境和上下文里。
行者孙llllll
Sightseeing is a basic form of tourism.For instance,people go to other cities or countries to see those beautiful seneries and places of interest.Via sightseeing,tourists can broaden their outlook,enlarge their knowlege and meet their needs to shop or enjoy their lives.
蜡笔小新新XU
根据我看的例句来说用tourism的最多，用travel也可以。1中国出境旅游网-文章页面！Welcome to China Outbound Tourism …2阳光假期旅游网、阳光假期会议中心；Sunshine holiday travel network, sunshine holidays Conference Centre3世界旅游组织 world tourism organization
