There are increasingly more companies offering boat trips in Cantabria, whether up the rivers, around the bays or on the reservoirs, they offer a different and interesting perspective of the region.
Aside from their ferry service to Somo and Pedreña, Los Reginas also offer excursions around the bay and el Sardinero beaches, as well as a longer excursion up the Cubas river (between Somo and Pedreña) and back.
Bahía de Santander offer environmental boat trips, with guided tours by boat of the wildlife and marine environment around Santander bay and Somo. Some of their excursions include a section on foot to see specific things of interest, and there is one which offers seabird and marine mammal watching trips at sea.
Excursiones Maritimas also offer 3 different excursion options along the coast, including Castro Urdiales, Oriñón and a trip around the bay of Santoña/Laredo, all with guided commentaries.
actiTur, based in Suances, offer two different itineraries, one around the Suances bay and its islands, and the other up the estuary of the River Besaya, both with commentaries on wildlife, history and industry.
For several years it has not been permitted to sail boats on Cantabria’s biggest reservoir, however just recently this ban has been lifted. There is still no company that does tourist boat trips here, but through the programme of events, Naturea Cantabria, organised through various Cantabrian assosiations, there are now several 3hr guided boat trips around the reservoir in 2013. They are very limited in numbers, maximum 12 people, and advance booking is essential. The dates for 2013 are: 29th March, 25th May, 30th June, 13th & 25th July, 15th & 24th August, 15th September and 12th October. See the link for more details.