Salar de Uyuni, the world's largest salt flat, is almost exclusively visited via multi-day guided 4x4 tours (typically 1-3 days, costing approximately $150-300+ depending on duration and inclusions) departing from Uyuni, as solo travel is highly impractical and dangerous due to the vast, remote, and challenging terrain, and lack of infrastructure. Accessibility within the salt flat is only possible with these specialized vehicles, often including basic, shared accommodations on multi-day excursions. The wet season (December to April) is popular for the stunning 'mirror effect' where the sky reflects on the shallow water, while the dry season (May to November) reveals incredible hexagonal salt patterns and offers ideal conditions for stargazing. Visitors should be prepared for high altitude (over 3,600m/12,000ft), extreme temperature fluctuations, and should pack warm clothing, sun protection, water, and altitude sickness medication; tipping guides is customary.