From Najera take the detour to San Millan de Cogolla, an ages-old monastic complex to the south. You can walk a path, which takes a day, or take a bus from downtown Najera. There are pensions aplenty in San Millan, and guided tours of both the mysterious cave monastery of Suso (way up on a hilltop, dating back to the 7th c.) and Yuso, a gothic pile in the valley. If you want to spoil yourself, book into the five-star hotel that now inhabits part of the Yuso monastery -- it compares to any Parador, and if you ask for a special price you often will get a great deal!
The following day you can take a well-marked path over beautiful hillsides and pastures, and rejoin the camino near Sto. Domingo de la Calzada. It´s a wonderful break from the crowds on the Frances, I highly recommend it.