Have you ever read the 'Treasure Island'? Knezak, being a small island that is not visited by many people, might be a place where you can for a bit imagine how it is to seek for that lost treasure. Especially if you are a bit of adventurer...
Use the waypoits to guide you. The path is marked but not many people walk to the top of the island so it is very overgrown in its lower part. See the picture to see what to expect, but it is advisable to have long trousers to avoid being scratched.
Hope you will enjoy the trip!