From Willisau station, you cycle past the Hasenburg open-air swimming pool to the Planet Path, which you follow to Wydenmüli. Where it joins the cantonal road, you leave route 38 and take the cycle path on the right to Ettiswil. On entering the village, take the road that leads off to the right up the hill to the Brästenegg. After 400 metres or so, you turn left. Passing the Burg Chapel, you come to Wyher Castle.
Passing the castle, you cross the cantonal road. Some 300 metres further on, you come to the Buchwald educational nature reserve.
Follow the little Rot stream until you come to the cantonal road, where you turn left. You now follow regional cycle path 94 through Ettiswil via Alberswil to the Agrovision Bugrain organic visitor experience and agricultural museum. At this point, you could dismount and visit the Kastelen ruins. From the museum, you follow the waymarking of routes 38/94 past Gettnau to a point before Zell, where you join the cantonal road and take the bridge over the BLS railway line. One hundred metres before the roundabout, you turn left and head for Willisau. You now follow the Heart Route waymarking via the Stocki to Willisau.