Here is a detailed trip report for a trip I took to Croatia and Bosnia, Herzegovina (plus brief stops in Montenegro, Ljubljana, and Amsterdam) in April-May 2015:
http://www.europeinpictures.com/croatia-bosnia-trip-report/
A quick summary: this was my second visit to Croatia and Bosnia and Herzegovina and my third (brief) stop in Ljubljana, Slovenia. This was a solo trip, and my focus, as always, was scenic photography. I revisited a few favorite places and saw many new ones, in just over two weeks mostly in a rental car. I started with a rough agenda: fly into Venice, shuttle to Ljubljana, train to Rijeka, Croatia, rent a car in Rijeka, drive down to Montenegro, drive back through Bosnia, and fly out of Zagreb at the end. I didn’t have fixed dates; I booked most of my lodgings as I went along, sometimes booking them the same day via the internet, sometimes driving up to a place without a reservation (relatively easy to do in May).
I did cover a lot of ground in a short time, with many one night stays, but it worked out well for me. I had mostly decent weather - only a few rainy days.
I saw a lot of waterfalls on this trip, in both Croatia and Bosnia.
Final itinerary:
Ljubljana, Slovenia (1 night)
Rovinj, Croatia (2 nights)
Day trips to Pula, Istrian Hill Towns
Lovran, Croatia (1 night)
Stop in Opatija
Zadar, Croatia (1 night)
Stop at Krka National Park, Sibenik
Trogir, Croatia (1 night)
Stop at Kravice Falls, Bosnia
Dubrovnik, Croatia (1 night)
Kotor, Montenegro (1 night)
Trebinje, Bosnia and Herzegovina (1 night)
Stop at Blagaj, Konjic
Sarajevo, Bosnia and Herzegovina (3 nights)
Stop at Travnik
Jajce, Bosnia and Herzegovina (1 night)
Stop at Una National Park, Bihac
Plitvice Lakes, Croatia (1 night)
Samobor, Croatia (1 night)
(fly from Zagreb to Amsterdam)
Amsterdam (1 night)
Again - full trip report with pictures (and videos) here: