Roads and Cycle Paths
There are lots of routes in this area. For a signposted trail with sites of interest along the way there is the Clyde Sea Lochs Trail, a 65 miles / 104 km self-guided sightseeing tour linking coastal communities along the Clyde Coast between Dumbarton and Arrochar.
The West Loch Lomond Cycle Path is a 17 mile cycleway and footpath that runs from Balloch at the southern tip of Loch Lomond to Tarbet. The path is traffic-free for most of the way, with two short stretches on minor roads, and is suitable for cyclists, walkers, wheelchair users and horse riders.
There are also lots of other routes and loops through the local glens and round the Rosneath Peninsula – check out resources like BikeMap and Komoot for routes uploaded by users.