how about going to qingdao and {having\have} holiday there

how about going to qingdao and {having\have} holiday there
how about going to qingdao and {having\have} holiday there

how about going to qingdao and {having\have} holiday there
having.
首先,how about+doing.
其次,用and连接,所以前后要保持一致.所以填having.

having

It is a good idea.