I have to drop my other half in Milngavie and meet him again at Inversnaid. I'd like to go for a bicycle ride from some point in the area of the route I'll have to drive. I've done the Aberfoyle -> Duke's Pass -> Callander loop before. I could do that again, but I'm looking for alternative suggestions. Looking at the map, I could park in Strathblane, go over the Crow Road to Fintry and come back via Killearn, is that a good route? Or would I be better going east past the Carron Valley reservoir?
I'm on a skinny-tyred road bike, so on-road routes please.
Thank you for any advice.
I'm on a skinny-tyred road bike, so on-road routes please.

Thank you for any advice.