The op was saying they would travel by car, so that changes things a little!
One plan might be to drive to oban taking in the amazing scenery on the way, aim to drive up the shores of loch lommond on the way, great inland loch.
Maybe edinburgh to largs on first day and take a look at the village of Fairlie where Fyffe yachts were designed and built. Sadly nothing left to see apart from a
wind cardinal in the shape of a yacht. But nice atmosphere around the marina and town.
Next day up loch lommond to oban, stay there a night, great place as is Adfern to the south as mentioned.
Next take the
ferry to Mull and drive to the island of Iona, then Tobermory for the night.
Back to oban and north as far as you like, all scenery is amazing from then on. If you feel like it drive up loch ness to inverness and then back down to edinburgh over the next few days.
As mentioned the west coast is best for sailing, the
East coast is nice too, but long open coast lines and no crinkly bits! Beautiful old
fishing villages all the way on the east coast.
One last place to mention is Tarbert south of Oban, very nice sailing village.
Its all good, if you want any more info, please feel free to ask.