Argyll, argubaly, gave birth to modern day forestry in the UK, on the banks of the Holy Loch near Dunoon. Today, we have more than 30% of our land area covered with forests and woodlands with an intricate network of tracks and trails to explore.
The Scotrail Highland Explorer gives access to a number of stations in Argyll, including Helensburgh, Lochgoilhead, Arrochar, Dalmally, Taynuilt, Connel plus Oban. Each is a great launch point for a gravel bike adventure with a number of routes mapped out for you in Komoot.
You can alos readily get the train to Gourock and ferry across to Dunoon, or to Wemyss Bay and across to Bute to get out on the trails for a great day out.
If you have more time, you can try some bikepacking. Markus Stitz of Bike Packing Scotland has devised two trails in Argyll - one in the mainland and one picking up the main islands. As well as offering great Bike Packing, these trails can be used to plan gravel bike days out too. The contrast in scenery is phenomenal so don't stop at one day out!