(1) What are the elements of the environment that you can control as the maker? Maybe think on a continuum from, say, a theater (where light, sound, what appears and what happen (at least in the stage portion of the room) are tightly controlled) to a totally unspecified walking-listening site.
(2) What are the non-environmental elements that are open to control or direction? (Instructions to the listener, the audio track itself…)
(3) Who is more in control of the experience? The maker of the walk or the listening walker who activates it? In what ways might you make space for the listener to assume creative control?