While you are at Lake Bohinj (Bohinjsko Jezero) take a cable-lift on the southern shore that will bring you to the skiing area that goes by the name of Vogel. Some great views from up there, a true bird's eye perspective!
The buses in Slovenia were very good and is only way to get up to the national park (short of hiring a car). There is an hourly service which was very punctual.
The bus drivers were helpful and when language bacame a problem a passenger helped us out with a translation.