For hiking, I would say Mistral for temps below 40F. Stretchy unlined softshell hiking pants. Really durable. Really comfortable. I wear similar pants to these all winter with or without a baselayer tights underneath.
For temps from 40 to 70 degrees, the lightweight Adventure pants would be fantastic. Comfortable for hiking. Great travel pants or just around-town long pants in hot weather.
REI also makes the usual assortment of running pants -- from lightweight tights to heavier warm running pants which would probabl be good choices for trail running.