My parents and I will be flying into Zagreb, then headed down to the Plitvice area to stay overnight. Assuming our flight isn't seriously delayed, we have a few hours to spend walking around Zagreb before we head out. Is it possible to see a little bit of the city centre in that time? We know we won't see everything, but planned to take the airport bus into the city and walk around for a little bit, have a meal, and then pick up our rental car (we were planning to use idealRent, and they would meet us somewhere).
Does the airport bus go to the main train station, or somewhere else? Is that close to some of the main sights like Jelacic Square and nice places to walk around? Is there a place there or close by that we can stow our luggage safely to walk around for a while?