Falls of Falloch is a really nice waterfall of appr. 9 meters high. The Falls of Falloch are located north of Inverarnan, almost along road A82. From Stirling take the A85>A84>A82 until you reach Crianlarich, from here it is a 4-5 kilometers further.
You have to park the car somewhere along the road. From the road it is a short walk to the river and the falls. I have seen people swimming in the pool under the waterfall and jumping from the top.