Feb 16, 2018 - 3:15 AM
in reply to armrev
>> From Lucerne we plan to do a day trip to Bern
For the most scenic reasonably direct route, put "via Trubschachen" into your timetable search. That will take you through the picturesque Emmental (Emme valley), which is characterised by rolling hills and traditional buildings. That is of course the place of origin of Emmentaler cheese.
The Golden Pass route (about which rockoyster has given you advice) will definitely provide a scenic way back. It will take around 3 hours.