1-Zagreb das Capital
Only churches, some elegant squares , and some sightseeing.
2- From zagreb you can make a tour it's called "Patricia waterfalls ", there you can do water rafting
3- Split an ancient authentic city like Alexandria and Prague "if you watch Game of thrones "
4-Take a boat from split and enjoy Asharha hvar & brac
5- split beaches are likely full of music and dancing " i can tell you more if you want about music on beach "
6-Slovenia by bus