From Marly you can easily hitchhike south, to the mountains Schwarzsee/Plaffeien/Giffers. Just walk a couple of meters from the roundabout (see sign Schwarzsee) and stand there, just before the drive-in of the garage of the Migros. There is a good space and cars can easily stop there for picking you up. I done this many times when I missed the bus. Easy but sucks in rain...