Flat bike routes

I recently got a bike but my fitness levels are currently super low. I'm looking for some nice flat routes to bike around Glasgow to build up my stamina. I struggle with all hills. For example, today I biked through Kelvin walkway, did the bit between kelvingrove and botanics which was lovely and flat (I turned around before I hit bigger hills 😄). Where could be nice and easy for a not very confident biker?