Take the train from Bern to Murten, stroll through this ancient village, have lunch, take the boat across two lakes for 18 chf per person if you check the web site, or with a coop supercard, to Neuchatel or St-Blaise, and visit the vinyards in that region.
St-Blaise is a wonderful village to walk through (take the path beside the stream, past the old watermill, and turn left after the railway bridge where you find three vinyards). But check the web for their names and tasting times!