* Dictate some of the content of his book *Ecce Homo*: This work, a self-assessment of his own philosophy, was mostly dictated during the last months of his life in 1888.
* Write several letters: Many of his letters from 1888 are filled with strange and even disturbing content, reflecting his declining mental health.
It's important to remember that Nietzsche was struggling with a severe mental illness in 1888, and his writing was heavily affected by this. He was not able to complete any major works, and his writings from this period are generally considered to be more fragmentary and less coherent than his earlier work.