We had enough time while in Split to do a day trip. Luke really wanted to visit the Plitvice National Park but that was a bit too far away for our liking. It was possible, but we really didn't want to do a 14 hours day trip. After asking around and doing a bit of research, Krka National Park was going to be enough excitement. The main purpose of our visit was to see the waterfalls at Skradinski buk, and I figured it was best and easiest to go with a tour group. I chose the "Swimming Beneath Krka Waterfalls" tour with Opcija Tours, but there were a few others that seemed just as good. To be honest, I can't remember why I chose this company, and if I am going to be really honest, I probably chose this one due to the price.
Other posts from Croatia: Catamaran Cruise, Krka Waterfalls, City of Split, Dubrovnik Apartment, Dubrovnik Part 1, Dubrovnik Part 2
In the summer, the rate of flow at Skradinski buk is around 18 cubic meters (4,755 gallons) per second, and in the winter it is around 43 cubic meters (11,359 gallons).