What should you do when it drizzles all day?
In Xi’an, it's a good idea to take Metro Line 6, travel 3-4 stops out of the city, and get off at Xing Qing Gong Park.
It's a pretty little park with a couple of lakes, several poetic bridges and pavilions, places to buy food and drinks, and toilets in convenient locations.
The walk itself is about a couple of kilometers long. Entry to the park is free.