The best place to go to is Cornalees Bridge as there is ample parking and in the summer the Visitor Centre is open, The Cut and many more walks are available from here.
I have enjoyed many a walk from here with terrific views, unfortunately even in the very best of weather the slight mist has caused havoc with my photographs.

Views of Dunoon, the Holy Loch, Loch Long and Loch Thom have more than made up for this.