On the tip of SA’s Eyre Peninsula, Port Lincoln’s livelihood is the tuna industry. But make no mistake, the 14,000-strong town deals in more than just that particular fishy gold: sharks are on the menu too. Popular with visitors for its once-in-a-lifetime status, tourists here actually pay to go underwater and see this apex predator up close. Luckily they feed their sharks well, since snorkelling with playful sea lions might otherwise mean you’re on today’s menu. “Galloped onto the tourist map on the back of Melbourne cup winner Makybe Diva, and thank God for the victory. Wild, bountiful, geographically diverse,...