Is the experience physically tiring? Is it mentally tiring? Is this necessary and, if so, is there room to rest?
What story does the visit tell? Does it have a satisfying beginning and end? Does the visitor need to experience the elements in a particular order?
Will visitors understand what to do if they pay little attention to the instructions?
Does there need to be a particular number of visitors for the experience to work?
Does the experience work for single visitors and groups? Couples and tour groups? School groups?
Will members of a group interact at their own pace? What happens to the group if they do?
Will visitors spend as much time as you hope? What if they don’t?