题目内容：

what are your doing for vacation ,回答to visit my cousin还是 visiting my cousin

优质解答

这是对度假内容的提问,答案应为what的宾语,故应为动名词短语Visiting my cousin 表示一般或经常的情况.
如果问题是What are you going to do for vacation?则答To visit my cousin,动词不定式表示将来的动作.