Upon arrival, take a late morning stroll along the Nervión River to witness the city's stunning architectural transformation first-hand. Make your way toward the [Guggenheim Museum Bilbao](https://www.guggenheim-bilbao.eus/en/plan-your-visit/hours-and-admission) to admire its shimmering titanium curves and the iconic floral sculpture known as Puppy as they glow in the midday light.
Cross the sleek, glass-bottomed Zubizuri Bridge to marvel at the soaring Isozaki Atea twin towers that frame the entrance to the new city. Spend the rest of your afternoon exploring the innovative Azkuna Zentroa cultural center, where you can admire Philippe Starck's 43 unique columns and look up at the spectacular suspended rooftop swimming pool.
As daylight fades, board the historic [Artxanda Funicular](https://www.google.com/search?q=Artxanda+Funicular+Bilbao+and+san+sebastian+5+days%0A+official+site) to reach the Artxanda Viewpoint, where you can admire a breathtaking panoramic view of the city's glowing modern skyline against the dusk. Complete your first night in the city center with a vibrant pintxo crawl along Calle Ledesma, sampling local gourmet specialties like the spicy Gilda served with a glass of crisp Txakoli wine.
Start your Saturday morning by immersing yourself in the atmospheric heart of the city, the Casco Viejo, where you can wander through the charming medieval Siete Calles and admire the Gothic facade of the Santiago Cathedral. After exploring the narrow alleys, head to the neoclassical Plaza Nueva for a mid-morning coffee under its elegant arches while soaking in the lively local energy of the weekend market stalls.
Continue your exploration by visiting the historic [Ribera Market](https://www.google.com/search?q=Ribera+Market+Bilbao+and+san+sebastian+5+days%0A+official+site), Europe's largest indoor food market, to admire its stained glass and sample local cheeses. Afterward, travel to the mouth of the river to marvel at the iron architecture of the Vizcaya Bridge, where you can take the pedestrian walkway 45 meters above the Nervión Estuary for a bird's-eye view of the surrounding coastal towns of Portugalete and Getxo.
Conclude your evening with a sophisticated walk through the Ensanche District, pausing to admire the neo-baroque architecture of the Teatro Arriaga beautifully illuminated against the night sky. Enjoy a refined Basque dinner at a tradition-filled tavern near the Jardines de Albia before taking a final moonlit stroll along the Abandoibarra promenade to see the city's modern art installations reflecting off the water.
Begin your morning by journeying to the coast to conquer the iconic 241 stone steps leading up to the rugged island hermitage of [San Juan de Gaztelugatxe](https://www.tiketa.eus/gaztelugatxe/). Ring the chapel bell three times for good luck while soaking in the panoramic views of the Bay of Biscay and the dramatic cliffs bordering the shores of Bakio.
After your coastal hike, travel to the vibrant fishing village of Bermeo to wander past the colorful houses of the Old Port and visit the Fisherman's Museum housed in the medieval Ercilla Tower. Conclude your afternoon by driving to the Mundaka Estuary, part of the Urdaibai Biosphere Reserve, to witness the scenic transition where the river meets the sea.
Spend your evening watching the twilight colors reflect off the pristine sands of Laga Beach, tucked beneath the towering limestone walls of Ogoño Cape. Conclude the day in the nearby town of Gernika to enjoy a quiet dinner of local specialty beans and grilled meats at a traditional Basque Cider House, soaking in the deep historical atmosphere of the region's symbolic heart.
Begin your first morning in San Sebastian with a walk along the golden sands of La Concha Beach, stopping to admire the ornate white railings and the views of Santa Clara Island. Afterward, head to the elegant Miramar Palace gardens for a panoramic perspective of the bay before reaching the western end of the promenade to see the waves crashing through the iron sculptures of the Peine del Viento.
Retreat from the seaside into the historic heart of the city to explore the narrow, cobblestone streets of the Parte Vieja, where you can marvel at the neoclassical symmetry of Constitution Square. Afterward, browse the high-quality local produce and gourmet stalls at the [San Martin Market](https://www.google.com/search?q=San+Martin+Market+Bilbao+and+san+sebastian+5+days%0A+official+site) before admiring the ornate Baroque facade of the [Basilica of Santa Maria del Coro](https://www.google.com/search?q=Basilica+of+Santa+Maria+del+Coro+Bilbao+and+san+sebastian+5+days%0A+official+site).
As twilight descends, cross the Zurriola Bridge to witness the modern glass cubes of the Kursaal Congress Centre illuminated expertly against the night sky. Indulge in the city's world-renowned culinary culture with a targeted pintxo crawl along Calle 31 de Agosto, stopping to savor the iconic burnt cheesecake at La Viña. Conclude your night with a refined drink at Atari Gastroteka, enjoying the vibrant atmosphere near the illuminated steps of the basilica.
Start your final morning by ascending to the summit of Mount Igeldo via its vintage wooden [Monte Igueldo Funicular](https://www.google.com/search?q=Monte+Igueldo+Funicular+Bilbao+and+san+sebastian+5+days%0A+official+site) to capture the most iconic panoramic views of the bay and the city below. Afterward, begin your journey across the border to the picturesque French-Basque town of Saint-Jean-de-Luz, where you can stroll through the historic center and visit the elegant Place Louis XIV.
Travel further north to the glamorous seaside resort of Biarritz, where you can walk across the bridge designed by Gustave Eiffel to reach the Rocher de la Vierge for dramatic ocean vistas. Spend the rest of the afternoon wandering the upscale boutiques of Avenue Édouard VII or watching surfers tackle the waves at the famous Grande Plage.
Return to San Sebastian to witness your final sunset from the Sagues seawall, where the rugged coastline meets the northern end of Zurriola Beach. Conclude your Basque adventure in the lively Gros District with a celebratory farewell dinner at the iconic Bodega Donostiarra, savoring their famous specialty pintxos to toast the end of your trip.