Your favourite rides within ~1 hour of Glasgow?

I’ve got a friend visting at Easter who has never biked in Scotland (but is a good rider) so I’m trying to plan a few rides to show the best of what’s on offer. So I’d really like your suggestions for your favourite / most memorable routes near-ish to Glasgow (say ~1hr drive away). The routes can be anything from a few hours to longer, but not 12 hour hike-a-bike epics. Good “natural” riding rather than trail centres is preferable.

Suggestions last night were:

  • Something round Mugdock because it’s local
  • Ben Lomond, good idea but could be a rambler dodging festival at Easter
  • Something around Aberfoyle (routes needed)
  • Ochil hills
  • Drumlanrig

I have seen a route guide from Tyndrum to Taynuilt that looks good, about 60km via Loch Etive I think. Anyone done this?