Sharks can be scary, that’s true. But I spent a couple of days on Kauai with Mike Coots, a photographer who lost half his right leg to a tiger shark while bodyboarding in 1997, when he was 18.

Gary Barlow is no stranger to adventure but he didn’t expect to encounter a tiger shark while filming for the second series of Gary Barlow’s Wine Tour in Australia. “Just as we were about to ...