Krka National Park is one of the most beautiful parks of Dalmatia. If you are in Sibenik, you should definitely visit this park which is only 20 minutes from Sibenik city center.
For more information you can visit visit-croatia website.
You can spend the whole day here, you can swim inside, sun bath, take photos. There are also some restaurants for lunch.
Entrance is 180 Kn. From entrance gate it is better to take the bus. Still After the bus you have to walk to reach the waterfall but it’s worth it. Also you can find nice photo shooting points on the road. Water is not so cold in summer.