Juliet
Juliet says this to her father. After he tells her she has to marry Paris and she refuses, they get into a huge fight. Juliet goes to Friar Lawrence and comes up with a plan to escape the marriage. Juliet goes back to her father and tells him that she now will be ruled by him, knowing that her plan is in place.
I think it means that the author is lonely, and is comparing himself/herself wandering to a cloud wandering over valleys(I think that's what vales is) and hills.
I'm not so sure, sorry. Hope this helps!
This is an instance of dramatic irony, taking into account that this figure of spech is when the implications of a situation, speech, etc, are understood by the audience but not by the characters in the play.
