Hi, we are 4 adults (57-71 years) and we are planning on visiting Croatia for 2 weeks in May 2018. We were thinking of maybe basing ourselves in 2 or 3 locations and doing day trips. We won't have a car so somewhere there are good transport options is esswntial. We were thinking of a Split/Dubrovnik breakdown. We will fly into Zagreb from Australia and thought getting connecting flight to Split and fly out from Dubrovnik to Greece. We like to stay somewhere we can access shops/cafes on foot. I was looking at Trogir as an option to staying in Split itself and catching the bus in to the city. Not sure if there is a similar location for Dubrovnik. Any suggestions would be appreciated. We don't want to be in "party central" with boozy tourists. We love to explore towns, historic sites and areas of beauty with low activity difficulty level. Hiking is out!
I would spend a day in Zagreb, then move down to Split which is wonderful - stay in the centre near or in Diocletian's palace. Do a day trip to Trogir, Day trip to Krk National park and falls - maybe a stop in Sibenik en route. Day trip to Hvar and the Pakleni Islands. Or a quick ferry crossing to Supetar on Brac. The ferry port, bus and train stations are all very close to each other in Split. After your stay in Split I would take the Krilo jet (it goes daily in the early morning) to Dubrovnik it stops briefly in Hvar and 15 mins in Kocula en route. In fact it might be really nice to have a day and night in Korcula, beautiful place like a mini Dubrovnik. Then on to Dubrovnik. I would stay in a B&B in the town centre. Day visits to Mljet, Elafiti Islands, Cavtat are all recommended - but I expect you'll be whacked.
One other alternative - and I think the best way to travel is to board a small cruise boat, 30 pax maximum, in Split, and Cruise down over a week to Dubrovnik. The boats are very comfortable with Ac and en suites. HB is offered and food is delicious. You will visit many interesting places every evening and may get guided tours thrown in! You don't need to worry about your accommodation. Have a look at (Google) Katarina Lines. www.katarina-line.com/cruises/croatia_land_and_southern_pearls_cruise_from_zagreb#!/excursions They actually do a 10 day tour starting in Zagreb, where you get a guided tour. Then to the fab Plitvice lakes and on to board the boat .... there are lots of optional excursions including wine tasting in Korcula. Without a doubt, this is what I'd do.