There are thankfully only 2 or 3 cars on Comino, belonging to the hotel and locals, if you're staying at the bungalows there is a minivan to shuttle you back and forth to the hotel itself. You can rent mountainbikes if you are staying at the hotel. This is a pleasant way to explore but not entirely cheap. Otherwise, Comino is only 2.5km by 1.5km in size, so you can hike around the whole island in an hour or two.