I'm signed up for an 8-day guided sea kayaking trip along the Dalmatian coast with Tofino Expeditions in mid-September. The trip is currently short by one or two participants and may be canceled unless a couple more people join. The paddling is easy to intermediate. The overnights are in small hotels. If anyone is interested, the link is below. I haven't traveled with TE yet but know that they have a great reputation. Contact them directly for info.
The link: "https://www.tofino.com/croatia/croatia-kayaking-the-dalmatian-coast/itinerary"