Thank to you!
About drone laws here, they are much similar to others. Not to fly over and near the people, objects where people lives, over cultural objects, not over 150 m, and in VLOS. About national parks generally flying there is not explicitly forbidden but at most interesting places there are always too many people to fly. As you can see I generally follow that rules.
Yes I would like to make some shots in Plitvice NP and Rastoke but I think I would continue using ground devices.
I made some videos last year around Trogir. Adriatic coast is still the best.