Free walking tours are a solid way to get your bearings in central Lima. You'll cover the historic center on foot for roughly two to three hours with a local guide who explains the basics: Plaza Mayor, the cathedral, colonial buildings, and a bit of street life. Expect a group of 10-25 people, a mix of backpackers and older travelers. The guides are usually enthusiastic students or young locals who work for tips; the tour itself costs nothing upfront but runs on a pay-what-you-feel model at the end. Most people tip between 10 and 30 soles per person depending on quality and group size.
The best time to go is the dry season from May to October when Lima isn't wrapped in the garúa coastal fog. Morning tours (starting 9-11am) are preferable because the afternoon heat and crowds build up. Pick the classic Historic Center tour and skip anything that promises to cover both Miraflores and Barranco in one free session—those usually feel rushed and watered down. Wear comfortable shoes, bring water, and don't flash valuables; the center has pickpockets like any big Latin American city. If the guide is just reading from a script, tip modestly and explore the neighborhoods on your own later.
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