It is true that the number of visitors has now increased in recent years for many reasons.
now和in recent years语义重复;visitor偏重指参观者,在这里还是用tourist好点,因为visitor的囊括范围小于tourist。
Clearly tourists are obviously of benefit from travelling around the world in many respects.
Clearly与obviously再次重复。sb be of benefit 的用法闻所未闻。respects错误,明显是想说aspects。