There is a reason there are over a million photos in google. It’s an amazing area, and although you won’t see everything in 4 hours, it is definitely not worth missing. Lovro was entertaining, and people could either explore on their own or stick with the him and learn more in depth about everything youre seeing. A coworker said he visited Croatia and regretted not being able to go to Plitvice, and having been now I know I would regret it too.
Also, it can be cold in September, 14C/55F, so would recommend bringing a jacket/raincoat and/or long pants if you’re susceptible. Or a poncho in case it’s raining. Even in the rain it was beautiful, and for a fair portion the tree canopy stops all the rain.