There is also well known Krka National Park with its seven travertine waterfalls and a total drop of 242 meters, the Krka River is a natural and karstic phenomenon.
To be in Šibenik and not to see Šibenik Cathedral St. James...
...or fortress St. Nikola...

...there is many things in Šibenik aquatorium to see, not be able to see them would be big loss for Yuor soul.