We’ve had some pretty amazing adrenaline adventures before – whitewater rafting, tombstone dives, even a bobsleigh run – and now La Fortuna goes into our history as a place where we have matched or even surpassed those thrills. Ever thought of coming down a mountain via zip wire? Nor had we, until the temptation was just too strong…. It’s on the Monday that whoever is in charge of La Fortuna weather throws a few switches and changes a few dials. Heavy cloud cover replaces bright sunshine, regular bouts of torrential rain flood the soakaways and send everyone running for shelter, and the imposing Arenal volcano disappears from view completely. The…