Next week I am planning a flight from my Home base at KFKL to go to Cedar City Utah - KCDC. Straight line terrain west of Denver is higher than me or my plane can deal with. so I will have to go around the terrain. I have some mountain flying experience but not a lot. The plane is Piper Lance ( NA ) I will be 200lbs under gross most of the time . This plane has lower service ceiling than most of the planes in the class. 12500 is highest I can comfortably fly considering high DAs. Any suggestions how to navigate this terrain will be appreciated.