Quite a few options about. Mugdock has so much apart from the obvious routes at the visitor’s centre. Over the road and through the moors and trees there is plenty of riding for all abilities. You can also link up to the west highland way, and go up to Carbeth, Dumgoyne and Drymen.
There is also tracks in Dougalston, the Allander walkway (to link up to the Kelvin)
There is also the Pipe Track from Blanefield via Dumgoyne to Killearn, the old railway from Strathblane to Lennoxtown, and on to Kirkintilloch where you can join the canal back to Bearsden (Westerton)
Other options are Kelvin cycle path to Glasgow, link up with the north clyde route out to Clydebank and back via the canal.
For more adventurous stuff there is always Carron Valley, loads of trails behind Loch Ard, and Aberfoyle.