In this somber and dark sonnet by Shakespeare, the speaker compares himself to all of the above except a deer. He speaks of himself as a man that has passed his youth and that faces death. Nevertheless, even if the speaker should continue his voyage to nothingness and death, which is quite a sight to behold in itself, he encourages his lover to love him even more for all that he is, is only transient.
The author wants to show that even though the Monkey King thinks he is an important ruler and is equal to the others, the other deities just consider him a monkey (and he might not be as important as he thinks he is).
The only stage direction is for every character to leave, letting Hamlet have his monologue. It allows the reader or listener to relate to Hamlet. It also usually shows exposition in the storyline.