I bought plane tickets for a 2 week trip to Spain in October of this year, 2021.
I leave on a Saturday, arrive the next day, Sunday, then
Mon, tue, wed, thurs, fri, Sat, sun
Mon, tue, wed, thurs, fri, leave Saturday
So 12 whole days, + part of the Sunday I arrive.
My approximate supposed itinerary is below. You may leave whatever suggestions you can think of, for example what time of day to leave each town, am I planning too much or too little time in each town?, and so on.
Sunday: Plane arrives in Madrid 8:25 AM. Find hotel. Palacio Real. If time if awake enough, Thyssen-Bornemisza (10-7 Sundays) and/or walk past various monuments. 1st night in Madrid.
Monday: Prado (open 10-8). If time, Museo de la Biblioteca Nacional, Real Jardín Botánico, a small house museum and/or walk past various monuments. 2nd night in Madrid.
Tuesday: Museo Arqueológico Nacional. If time, Museo de la Biblioteca Nacional, Real Jardín Botánico, a small house museum and/or walk past various monuments. 3rd night in Madrid.
Wednesday: Train to Toledo. Find hotel. Start in Southwest: Sinagoga del Tránsito; if open, Sinagoga de santa María la Blanca; if time: Ayuntamiento de Toledo (city hall); Visigothic museum (Museo de los Concilios y la Cultura Visigoda, Catedral, Cuevas de Hércules, Museo de Santa Cruz. Sleep in Toledo.
Thursday: 1-2 or more sites not seen yet. Trains to Cordoba (change trains in Madrid), probably leave mid-late afternoon, arrive early-mid-evening. 1st night in Córdoba.
Friday: Mezquita, Alcázar de los Reyes Cristianos; if time, Baños del Alcázar Califal, Museo Vivo del Al-Andalus/Torre de la Calahorra, Templo Romano, other monuments. 2nd night in Córdoba.
Saturday: Sinagoga, Museo Arqueológico de Córdoba, city walls next to the synagogue. Train to Granada late afternoon-evening. 1st night in Granada.
Sunday: Alhambra. 2nd night in Granada
Monday: Guided or unguided walking tour; possibly San Juan de Dios, Capilla Real, Catedral de Granada; if time: old wall, Palacio de los Olvidados, Museo cuevas del Sacromonte, La Madraza, Casa de Castril (house with small archaeological museum). 3rd night in Granada
Tuesday: Train or bus to Seville. Archaeological museum; Metropol Parasol, Antiquarium de Sevilla (small museum of Roman remains), other monuments. 1st night in Seville
Wednesday: Alcázar, possibly Ayuntamiento; if time, Archivo de Indias, Hospicio de los Venerables; Barrio Santa Cruz (former Jewish quarter). 2nd night in Seville
Thursday: Casa de Pilatos; if time, Palacio de la Condesa de Lebrija; if time, Palacio de las Dueñas or other muse museums if not seen yet; if time, Torre del Oro, Triana area. 3rd night in Seville
Friday: Plaza de España, possibly Catedral if not seen yet. 4th nigh tin Seville
Saturday: Plane leaves from Seville 9:25 AM