Second Life: Engaging Virtual Campuses * By Denise Harrison

Reference to this article was posted on SLED. When I read it, I found this description of using SL to tour and tell a story without concurrent facilitation of another avatar or tour group activity. When applied to a mirror build, this can be another method for providing information within spatial context that allows the customer to experience the mirror world at their own leisure. A little complicated when working with a private island and avatar roles but still doable by thinking through the method to automate notification that a user wants to visit the island.
A snippet:

The University of Delaware uses one of the easiest and most effective tools in Second Life to tell the story of their campus--an automated tour. Visitors who opt to take the tour are taken on a 5-and-a-half-minute virtual fly-over of the campus. As the tour arrives at key areas, text appears on the screen explaining the section and how it is used. During this quick tour, one learns that they have a number of classrooms in varying sizes, from small areas that seat a dozen or so people to an outdoor classroom that seats 60. There are video and PowerPoint screens available for instructors and presenters, areas for students to build projects, and sections where faculty can meet. The University of Delaware also has an observatory that, according to the tour, will feature a working telescope for viewing the latest astronomy discoveries. The university even pays homage to Delaware's role in World War II with a replica of a lookout tower.

The complete article.