What about a bike ride through Magma UNESCO Global Geopark?
Difficulty of tour is graded to be intermediate:
St. Olavsruten, Egersund municipality: A three hours guided bicycle ride along the GeoBike route St. Olav with railway, geology, culture and salmon history included. Bike rental possible.
Flekkefjordbanen, Flekkefjord municipality: Three hour rail tricycle tour along one of the most beautiful museum railroad tracks in Norway. 17 kilometres and 17 tunnels. Rental of rail tricycle NOK 500,-.
Minimum price NOK 4000,- and maximum number of people on a tour per guide is 25. Ring to organise your tour and receive a price quote! Educated guides.