althepal, there is absolutely loads of good riding in the Dunoon and surrounding area. We’ve been lucky and brought up on it, however the vast majority of it needs local knowledge.
The problem is that apart from the main walkers paths (Pucks Glen, Bishop’s Glen, Glenbranter), none of it is particularly obvious. This isn’t helped by huge timber extraction activity currently that has added lots of new forest roads, linking things up, which haven’t made it on to maps yet.
As you say, you need to give tandemwarrior a shout.