From car park in town, cross footbridge by Festival Theatre and climb to A9. Cross and head straight on past Middleton of Fonab farm. The climb carries straight on, past a stone circle to reach a brilliant descent into Strathtay (via the golf course…). Head R down the road until you get to a track leading up to Loch Derchulich. Carry on beyond the loch (steep in places) until it heads down (fast!) to Loch Tummel. Turn R and follow the road until you can get across the river by a footbridge (Jubilee Bridge?). Brilliant ST down to the River Garry, then head upstream to the Soldier's Leap in the Pass of Killiecrankie. Find a minor road heading under the A9 and leading to a climb onto Ben Vrackie. Follow this to the Bealach na Searmoin (marked on 1:25000 maps) and then you have 11 minutes to get back to the car via Moulin.
40kms, some brilliant riding. Sorted.
EDIT: would join you Sunday but off to SXC at Aberfoyle if I shake this **** cold