Croatia is an amazing country. I had the chance to spend a couple of weeks there 4 years ago, visiting Istria (from Rovinj), the central coast part including the islands (from Zadar) and Plivitce lakes. I have a lot of good memories from that country and I would be more than happy to go back.
On a different trip, I had also visited Split and Dubrovnik. Dubrovnik was my favorite of both :)