Two are traveling to Scotland this July. Starting in Edinburgh, hiring a car and want to visit Glencoe, Mull, maybe Iona, Loch Lomon, back to Edinburgh. Any advice on how to spread these out over seven days? Would it be too much to add Isle of Arran or Cumbrae? Where do I go to map out the routes? We don't want to spend too much time in the car but want to see a variety of landscapes.