If you are looking for a peaceful activity, a pedal boat in Rovinj is the way to go! It's an excellent choice for the whole family as you can get away from the crowds and enjoy an afternoon by yourself on the sea. Lounge on the pedal's platform or jump in the sea. Either way, it will recharge your batteries!
Even if you've never been on a pedal boat before, it is easy to operate and doesn't require much thinking. Just have fun and go with the flow!