Bilbao's Euskotram, running up and down the Ría de Bilbao (aka Nervión Estuary) past the Guggenheim to the Mercado de la Ribera, is an attraction in its own right: silent, swift, and panoramic as it glides up and down its grassy runway. The EuskoTren leaving from Atxuri Station north of the Mercado de la Ribera runs along a spectacular route through Gernika and the Urdaibai Biosphere Preserve to Mundaka, probably the best way short of a boat to see this lovely wetlands preserve.
For up to 24, 48, or 72 hours, the Bilbao Bizkaia Card allows for unlimited use of the metro, buses, train, tram, and Artxanda funicular railway all around the Bizkaia region; discounts on certain restaurants, bars, and shops; and free entry to a variety of cultural activities, including more than 25 museums, monuments, and sights, such as the Guggenheim, Museo de Bellas Artes de Bilbao, and Museo de Reproducciones Artísticas de Bilbao. The card costs €30 for 24 hours, €35 for 48 hours, and €40 for 72 hours.
The BARIK card is good for tram, metro, bus travel, and for the Furnicular Artxanda, Renfe, Feve and Euskotren trains, and costs €3 for the card, with a minimum additional value of €5, and maximum of €45 by credit card. Cards can be purchased at BARIK vending machines in the Bilbao metro stations, or from any of the four Bilbao metro help offices (Attención al Clientes de Metro Bilbao) kiosks, and some tobacco shops. Metro help offices are in or near four stations: Areeta, San Inazio, Casco Viejo, and Ansio. Hours are weekdays 8:30–7:30, with the San Inazio location also open Saturday 8:30–3. One card can be used by up to 10 people. Pass your ticket through the machine as you get on and off metros, trams, buses, trains, etc. and it is charged according to the length of your trip. Transfers cost extra.
Bilbobus provides bus service 6:15 am–10:55 pm. Plaza Circular and Plaza Moyua are the principal hubs for all lines. Once the metro and normal bus routes stop service, take a night bus, known as a "Gautxori" (night bird). Six lines run every 30 minutes between Plaza Circular and Plaza Moyúa and the city limits on Friday 11:30 pm–2 am and on Saturday overnight until 7 am.
Metro Bilbao is linear, running down the Nervión estuary from Basauri, above, or east of, the Casco Viejo, all the way to the mouth of the Nervión at Getxo, before continuing to the beach town of Plentzia. There is no main hub, but the Moyua station is the most central stop and lies in the middle of Bilbao's Ensanche, or modern (post-1860) part. The second subway line runs down the left bank of the Nervión to Santurtzi. The fare is €1.50–€1.75 for a one-way ticket, €3–€3.50 for a return ticket, just €0.82–€1.10 with the Barik, or €4.60 for a day ticket.