Ben Lawers is the high point of a ridge of seven Munros on the north side of Loch Tay. At 1,214 metres it's the highest mountain in Perthshire and the tenth highest Munro in Scotland. It's made of soft, lime-rich schists, unusual for Highland mountains, and that rock supports internationally important alpine plant communities. The range is a national nature reserve.
It's a popular but serious hill day: the ridge is high and exposed, so pick settled weather and carry proper kit. Just to the west, the Meall nan Tarmachan ridge is the other classic hill walk from Killin.