If you've looked into the South Island at all, you'll find that we've by-passed one of the island's biggest attractions - Milford Sound.  It was about a 2.5 hour drive from Te-Anau and would have been easily accessible, but this is an extremely busy this time of year for them.  There is one route in and out of the area and traffic is really heavy.  Many tour buses head that way as well.  This is also home to the world famous Milford Track which is so popular now that it must be booked ahead of time just to walk.  Although we would have liked to view these areas, we felt that our time would be better spent in other areas.  Maybe next trip?  :)