To the south west of Kirriemuir, Reekie Linn Falls offers a spectacular sight. The name ("smoking pool") gives you an idea of what to expect!
A picnic site and car park on a bend of the road leads by 200m to the wooded gorge of Glen Isla with precipitous viewpoints of the defile where the Isla is squeezed and falls in tiers for 100 feet. You can walk further along the glen as well, where there is an excellent loch side restaurant and a tearoom.