During your 14-day tour of Spain's cities, there are several optional activities you can consider to enhance your experience and explore specific interests. Here are some suggestions:

1. Flamenco Show: Immerse yourself in the passion and intensity of traditional Spanish flamenco. Attend a live performance in Madrid, Seville, or Barcelona and witness the captivating dance, soulful music, and powerful storytelling of this iconic art form.
2. Tapas Tour: Embark on a culinary adventure and join a guided tapas tour in each city you visit. Discover local hotspots, try a variety of delicious tapas dishes, and learn about the culinary traditions and flavors of different regions.
3. Wine Tasting in La Rioja: Take a day trip to the famous wine region of La Rioja and indulge in wine tastings at renowned wineries. Learn about the winemaking process, sample different varietals, and savor the flavors of this celebrated wine-producing area.
4. Gaudí Tour in Barcelona: Explore the architectural masterpieces of Antoni Gaudí in Barcelona. Visit iconic sites such as the Sagrada Familia, Park Güell, and Casa Batlló. Enhance your visit with a guided tour that provides insights into Gaudí's unique style and vision.
5. Flamenco Guitar Lesson: Learn to play the guitar in the birthplace of flamenco. Take a private lesson in Seville or Granada and discover the techniques, rhythms, and melodies of this captivating instrument under the guidance of a skilled instructor.
6. Alhambra Night Visit: Experience the magical ambiance of the Alhambra in Granada during a night visit. Explore the stunning palace and gardens illuminated by soft lights, creating a romantic and enchanting atmosphere.
7. Valencia City of Arts and Sciences: Visit the futuristic City of Arts and Sciences in Valencia, a complex of stunning modern architecture. Explore the interactive science museum, enjoy a 3D movie at the IMAX cinema, or visit the Oceanographic, Europe's largest aquarium.

These optional activities offer unique opportunities to delve deeper into Spanish culture, cuisine, and attractions. Choose the ones that resonate with your interests and preferences to tailor your tour and create unforgettable memories of your journey through Spain's vibrant cities.