Northern Peru's coast strings Máncora's Pacific surf town, Chiclayo's Lord of Sipán Moche tomb museum, Trujillo's Chimú citadel of Chan Chan (the world's largest mud-brick city), and the Pacific cevicherías between.
Northern Peru's warmest swimming window with Máncora at high season, Chan Chan walking pleasant, and the Lord of Sipán museum at Lambayeque comfortably navigable.
Cooler Pacific season with Máncora surf at peak swell, Chiclayo and Trujillo accessible without coastal fog issues, and the Moche pyramid trail uncluttered.
Sea cooler but surf at peak, Chan Chan walks pleasant, and the Marinera Festival in Trujillo late January aside, winter is the inland archaeological window.
Marinera National Festival in Trujillo last week of January fills the Plaza de Armas with the country's defining traditional dance competition.