Get a ferry timetable at Split ferry terminal and find one of the little routes that goes around several of the small islands. The ferries provide the islanders' bus service, and deliver the post and supplies. If you pick a good route you'll sail into half a dozen tiny blue-water harbours of outlying islands, and all for just a few pounds. Most tickets are valid all day, so you can step off for lunch on an island before continuing. The ferries usually do a circuit, so you'll be back in Split by nightfall. If you are backpacking, you can see almost the entire coastline this way.
Get a timetable at the Split ferry terminal on the waterfront. Most staff speak English and will know the best routes to take.
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