Now back so in case anyone finds this thread on a Google search in the future, to help those people....
Nearest Zadar, Lake Vransko (43.932903, 15.512441) looked good. We only had an hour one evening to visit there but Pygmy Cormorant was easy. If weather had been better, there is a pair of Eagle Owls nearby that can be found in eBird but we did not try for them.
We stayed in Posedarje to access the peninsula to the north. Veliko Blato Observation Deck area (44.360749, 15.158109) was good for Rock Partridge and waders, ducks, etc. Further north, Kolansko Blato area (44.515932, 14.918380) looked better for wetland species but we could not work out access to the viewing platform possibly due to high water levels and building works. If we could have worked out access, we would have done better.
Scops Owl in the square at Posedarje at 44.210515, 15.477978 was nice.
An hour & a half or so inland around Plitvice Lakes National Park looked interesting and I am sure would yield birds later in the spring in better weather conditions.
I will be adding observations in the Trip Reports forum when opportunity presents but thin pickings in the conditions save for eleven Rock Partridge seen and another nine heard - which as this was a one target species trip probably highlights our priority!
Due to be off to Croatia to look for Rock Partridge on Sunday for a few days with a birding mate. We are flying into Dubrovnik from Gatwick with easyJet and due to be hiring a car from Avis. A flat is booked for three nights near Posedarje. It seems from recent eBird reports and a friend's...
www.birdforum.net
Better Rock Partridge pics will be added to that thread but ordinarily, you are looking amongst rocks like the attached. In the pic, the Rock Partridge is more obvious than normal...
All the best
Paul