well , i think u have a nice place to visit ...
my name is danijel and i am from croatia (rijeka)
we all have consternation for stealing ur stuff, i would lie if i say we have no thiefs here.. there is a lot of cours.. but thiefs nave no nationality..
only logical is to take your cam in a backpack and have it all the time with you, i live here and ill go to my work every day but my backpak with all my photo stuff is always there... every day.. coz you newer know the time of a special moment to make a photo
but... if you carry lot of stuff might be a lil heavy..
hell yeah... its a dilemma..
ill give you a advice to visit place on croatian coast from umag to dubrovnik... in some places a very very extremely costly like dubrovnik and i know that is not special city except beautyfull old buildings
(my own judgement)... but many places r nice and convivial
ill hope you enjoy your trip , be carefull and god luck