One way to hold this phrase: tourism is travel, and health is the reason for it. The point of the trip is not the view but the body. From there the two meanings are just two reasons a body might send you abroad — to be treated, or to be looked after.
可以想成：tourism 是旅行，前面掛上 health，等於把這趟出門的理由換成「身體」。重點不在風景，在人本身。兩個意思就是身體派你出國的兩種理由：一種是去把病治好，一種是去把自己養好。
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