Glad to hear you'll be joining us, Landshark. If you haven't done so already, let TracyB know and she'll put you on the log of attendees. The Grand Canyon, Vegas (including Hoover Dam), Zion, and Bryce Canyon are all destinations that will be part of SW '13. I think you might want to think about extending that stay at St. George for a little.
Plenty of people will be heading out via your intended direction.