There is a network of ferries that conveniently runs between all of these top islands in Croatia to visit. These ships are certainly not glamorous sailboats, to say the least, but they do get you to the islands at a very affordable rate, allowing you more time (and money) to actually to explore the islands! It is not easy to see them all (like we said), but here is one idea for a week-long vacay.
We are planning to come back at the start of September for 2 weeks to visit different islands for some beach and sun. To give you some background, we loved Santorini, Milos and the quieter / smaller places in Crete (Loutro, Falassarna, Samaria Gorge). We enjoy beach time, some hiking, site seeing, good wine / food and good / buzzy atmosphere at night for dinner / tavernas.