Sanlúcar De Barrameda.

Sure, I'd be happy to help you plan your ideal itinerary for one day in Sanlúcar de Barrameda! Here's a sample itinerary that you might enjoy:

Morning:

• Start your day with a delicious breakfast at one of the local cafes or bakeries. I recommend trying some of the traditional pastries like "tortas de aceite" or "bizcochos de Sanlúcar".
• After breakfast, head to the Plaza del Cabildo to visit the town hall and the beautiful Baroque-style church of Nuestra Señora de la O.
• From there, take a stroll through the historic center of Sanlúcar, admiring the charming streets and buildings that date back to the 16th and 17th centuries.

Afternoon:

• For lunch, head to the Bajo de Guía neighborhood, which is known for its seafood restaurants. Try some of the local specialties like "langostinos de Sanlúcar" (Sanlúcar prawns) or "tortillitas de camarones" (shrimp fritters).
• After lunch, take a walk along the beach and enjoy the views of the Atlantic Ocean. You can also visit the nearby Doñana National Park, which is a UNESCO World Heritage Site and home to a variety of wildlife.
• In the afternoon, visit the Castillo de Santiago, a 15th-century castle that now houses a museum dedicated to the history of Sanlúcar and the surrounding area.

Evening:

• For dinner, head back to the historic center and try some of the local tapas. Sanlúcar is known for its "manzanilla" wine, so be sure to try a glass or two with your meal.
• After dinner, take a stroll along the riverfront and enjoy the views of the Guadalquivir River. You can also visit the Mirador de la Peña Nueva, a lookout point that offers panoramic views of Sanlúcar and the surrounding countryside.
• Finally, end your day with a visit to one of the local bars or clubs, where you can enjoy some live music or dance the night away.

I hope this itinerary gives you some ideas for how to spend your day in Sanlúcar de Barrameda. Have a great trip!