Rent a kayak in Cavtat and explore on your own what the coast offers. Sometimes, you just need to get away from the crowd and have a moment for yourself. Renting a kayak for one person is the perfect way to do that! You will have your peace and quiet while admiring nature all around you. Plus, kayaking is also an amazing way to get in some exercise.
Regarding safety, you don't need to worry about anything, because the staff will provide you with equipment and safety instructions.