Every ones got their favourites and you've got to include Tarbert and Caladh
An easy day trip. Largs (or Kip) Rothesay, through the Kyles, Caladh, Tighnabruaich (don't know about getting ashore there), Tarbert, Portavadie and back round the south of Bute on the way back. Less than 60Kn miles all in.
FYI. Logistically not much difference between Largs and Kip. Largs has a better slip....into the marina, Kip's overnight charges aren't as brutal as Largs. (three days/two nights ain't going to make much difference)
PS round trip to Campbeltown is 80Kn mls from Largs and can get a bit bumpy especially around south east tip of Arran.