We (two adults) are going to Rovinj next week, and won't be hiring a car. Has anyone done any of the excursions listed on the Rovinj tourist board website? (I'm assuming these are organised trips, not just suggestions for people to do on their own!) e.g. trips to caves, off-road exploring of Istria, Lim channel. I was surprised it didn't list a fortified towns excursion, which we'd like to do. Any recommendations?