Time Out says
Several companies offer boat tours of the fjord-like Limski Canal – perhaps the most visitor-friendly is the four-hour jaunt run by Rovinj-based Excursions Delfin. Setting off from Rovinj harbour at 1pm daily in high season, a pretty boat with a top deck for prime sightseeing takes four hours to explore the green waters of canal, with its steep, forested slopes and plentiful oyster beds. Much is made of the canal’s piratical past – the boat makes a 20-minute stop in front of a cave thought to have been used by Captain Morgan himself. The trip finishes back in Rovinj.