From Anniesland as long as you head north or west you can't go too far wrong. I'd recommend heading out towards Milngavie with a map and seeing where you end up. But if you want specifics.....The one Gav suggests is a good one too. Head for Milngavie, pass West of Scotland and Esporta out to Strathblane, turn right to Lennoxtown, on way out of Lennoxtown turn right for Torrance then turn right at the roundabout in Torrance, stop at Solid Rock Cycles in Balmore, then straight on through the roundabout and eventually you end up coming down the steep hill at the side of Asda, Bearsden. An easy 25 miles or so.
But don't be afraid of the Crow Road. Heading north it's not too bad - I'm not saying it's easy right enough. Do the same as above but turn left in the centre of Lennoxtown over the Campsies and down into Fintry, straight through Fintry and turn left at the next junction and you're on the road for Killearn, then just keep going past the Dumgoyne distillery and you'll be back in Milngavie in no time. Another 40 miler admittedly a little more demanding.