San Sebastian is a beautiful city in the Basque Country of Spain known for its stunning beaches, delicious food, and vibrant culture. Here's an ideal itinerary for 7 days in San Sebastian:

Day 1: Arrival

• Arrive in San Sebastian and check into your accommodation.
• Take a leisurely stroll along La Concha Beach and enjoy the views of the bay.
• Head to the Old Town (Parte Vieja) for dinner at a traditional pintxos bar.

Day 2: Explore the Old Town

• Start your day with a visit to the San Telmo Museum to learn about Basque history and culture.
• Wander through the narrow streets of the Old Town and visit the Basilica of Santa Maria.
• Enjoy a pintxos crawl for lunch, trying different small dishes at various bars.
• Relax in the evening at a local bar with a glass of Txakoli, a traditional Basque white wine.

Day 3: Day Trip to Bilbao

• Take a day trip to Bilbao to visit the iconic Guggenheim Museum and explore the city's vibrant art scene.
• Enjoy lunch at a local restaurant in Bilbao before heading back to San Sebastian.
• In the evening, dine at one of San Sebastian's Michelin-starred restaurants for a special culinary experience.

Day 4: Beach Day

• Spend the day relaxing on Zurriola Beach, popular with surfers and sunbathers.
• Take a surfing lesson or rent a paddleboard to enjoy the water.
• In the evening, watch the sunset from Monte Urgull for panoramic views of the city.

Day 5: Day Trip to Hondarribia

• Take a day trip to the charming coastal town of Hondarribia, known for its colorful houses and historic fortress.
• Explore the cobblestone streets of the Old Town and visit the Castle of Charles V.
• Enjoy a seafood lunch at a waterfront restaurant before returning to San Sebastian.

Day 6: Mount Urgull and Aquarium

• Hike up Mount Urgull for breathtaking views of the city and the sea.
• Visit the Aquarium of San Sebastian to learn about the marine life of the Bay of Biscay.
• Relax in the evening with a sunset cruise along the coast.

Day 7: Departure

• Enjoy a final breakfast at a local cafe before checking out of your accommodation.
• Take a last stroll along La Concha Beach and buy souvenirs at the local shops.
• Depart from San Sebastian with fond memories of your time in this beautiful city.

I hope this itinerary gives you a good idea of how to spend a week in San Sebastian! Let me know if you need any more recommendations or tips.