Plenty of riding to be had...the rail network is very good and can get to places that aren't quite local but not far off - Stirling is 'nearby' for some hills, also heading up to Milngavie gives you access to a lot of riding round the West Highland Way - you can ride out to Milngavie - along the Kelvin something or other - follows a river I think - it's a nice pedal.
Glasgow MTB Club has loads of local knowledge, if you hook up with them you will find oceans of places to go ride.