Portugal is a port of call for many cruise liners. Most stop at Lisbon, while a few include Madeira in their itinerary. There are also companies that offer more localized cruising opportunities, including River Cruise Tours, which offers luxury boat trips along the Douro River from Porto to the Spanish border.
Local Cruise Line
River Cruise Tours. 888/942–3301; www.rivercruisetours.com.