Plitvice lakes was in my list of things to do before I die. I have been thinking about this place from past 7 or 8 years. At last I managed to tick my list this year. This one picture will tell you how much any person like to see this place. If you love nature this is like ultimate destination.
There are buses that will take you from car park to starting point of Route A and B, from there you have to walk. A down hill walk until next point will lead you place from where there is a pleasure boat ride to starting point or continue long walk. Just walk and enjoy the beauty and you can take plenty of photos. I think Plitvice lakes doesn't need description, pictures explains the beauty and reason for the visit.
Best place to land is Zagreb or Zadar. If you can add more days to your trip even Split and Dubrovnik are good starting points to land and see other coastal places in Croatia.
Entrance prices and other details in official website: http://www.np-plitvicka-jezera.hr/en/plan-your-visit/operating-hours-and-prices/
