South Australia is a conundrum - so much to do; so little time! Adelaide's feast of great restaurants and multitude of cultural entertainments compete with easy getaways such as the Barossa Valley or Kangaroo Island. And then there's the Flinders Ranges and the otherworldly experience of the SA outback... Maybe you'd better stay an extra week? DINE OUT - grab a quick plate of Coffin Bay oysters in an arty cafe, or linger over a succulent steak while you decide if it suits a McLaren Vale sh