Went up to Callander last week. Stayed at Forest Holidays Strathyre and did two 40 km loops on their hire bikes. The cabins are right on NCN7 which makes accessing the paths super easy.
Fabulous off-road cycling. We particularly enjoyed checking outage roman fort which NCN 7 runs over, and the Iron Age hill fort (Dunmore) which the Great Trossachs path runs past. There is also a submerged crannog which we would have loved to check out.
Happy to share routes if anyone wants them. Can't promise you the glorious weather we had.
We did a loop of Loch Lubnaig on our first day, including the forts and some fairly hilly terrain, and then came back down the A84 from Strathyre because we fancied a flat return (there are off-road paths higher up that look like they would link up). No close overtakes at all.
the Bothy cafe at Strathyre is a cyclists dream. lovely folk. lots of outdoor seating. good food. and pétanque. They're selling their own ice cream from this weekend.
<we then had a walking interlude - climbed Ben Ledi from the Lubnaig side (steep!) and down the Stank Glen route -- not sure I would recommend if it was wet, but a good walk this year>
Then a second 40 km loop over around Loch Venacher, and back along the Great Trossachs path. Parts of the Loch Venacher path are simply gorgeous, and very flat. Worth diverting to Loch Achray at the end for toilets. Then back through Brig o'Turk and up onto the Path.
Great Trossachs path had sections with steep ascents that were hard cycling for us -- especially on rental mountain bikes -- but amazing views and some very very fun slow winding descents heading back towards Callander.