Pick up a hire car in central Madrid on Monday morning. Book an automatic transmission before race week - this is not a normal preference, it is a post-marathon requirement. Your left leg and the clutch pedal will not have reached an agreement by Monday morning. Enterprise, Hertz, and Europcar have central Madrid locations.
Drive northwest on the A-6 motorway, exit at San Lorenzo de El Escorial: approximately 50 minutes.
The Sierra de Guadarrama in late April is in the specific season when the lower pine forests are green, the high peaks still carry patches of snow, and the Lozoya Valley below is emerging from its long mountain winter. The Parque Nacional de la Sierra de Guadarrama (established 2013) covers the range between Madrid and Segovia. April is before the summer hiking season; the valleys are quiet.
Night One: El Escorial
The Real Monasterio de San Lorenzo de El Escorial (closed Mondays - if the marathon is on a Sunday, plan the interior visit for Tuesday) is the most important Renaissance building in Spain: a 206 by 161-metre granite block commissioned by Philip II, begun 1563, completed 1584. Palace, monastery, school, and royal mausoleum simultaneously. The Panteón de los Reyes in the basement holds the remains of almost every Spanish monarch since Carlos I; the Biblioteca Real contains 45,000 manuscripts and a ceiling fresco by Pellegrino Tibaldi.
The exterior granite courtyards are vast and flat. The Jardines de los Frailes on the south terrace are formal gardens at monastery level, flat throughout, with views down the valley and across to the mountains. In late April, the gardens are in spring bloom.
Stay: Hotel Victoria Palace, a flat walk from the monastery.
Nights Two and Three: Rascafría and the Lozoya Valley
Drive from El Escorial over the Puerto de Navacerrada (1,858m) or the Puerto de la Morcuera and down into the Lozoya Valley to Rascafría: approximately 45 minutes. In late April the mountain road is normally clear; check DGT road conditions at dgt.es if in any doubt.
The Bosque de Finlandia (Finnish Forest), directly opposite the Monasterio de Santa María de El Paular, is the post-marathon walking asset of this itinerary. Named for a 1950s reforestation project using Scots pine varieties, it is a flat forest trail along the Lozoya River: packed earth and grass, minimal gradient throughout, running through pine and poplar stands with a small reservoir and lake section. Allow two hours for a comfortable circuit.
The Monasterio de El Paular (the only functioning Carthusian monastery in Spain, founded 1390) accepts visitors for guided tours on specific days - check monasterioelpaularcr.com for current schedules.
On the return to Madrid, stop at Manzanares el Real for its 15th-century castle (Castillo de los Mendoza) on the shore of the Santillana reservoir. The lakeside promenade below the castle is flat and gives the full view of the tower reflected in the water.
Stay: Parador de Rascafría (Hotel Santa María de El Paular), occupying the former Carthusian monastery itself - genuine cloistered courtyard, rooms in converted monks' cells, mountain valley setting. The restaurant serves judiones de La Granja (large white butter beans slow-cooked with pork and chorizo, the classic mountain dish of this region) and Lozoya River trout. Book well in advance; it fills quickly in late April.