The resorts on the north side of the main Rhone river valley are popular , looking out southwards towards the Peninne Alps and still part of the southern slope of the Bernese Alps , such as the family oriented resort of Crans-Montana . The resorts on the north side of the main RhÃ ne river valley are popular , looking out southwards towards the Peninne Alps and still part of the southern slope of the Bernese Alps , such as the family-oriented resort of Crans-Montana .