High mountain treks and horseback rides work best from late spring through early autumn (November to March), when passes are snow-free and temperatures more stable. Stargazing trips happen year-round, though clearer skies often come in drier months. Check before you go, especially for multi-day mountain crossings that depend on weather windows.

Multi-day experiences like the high mountain horseback crossing and full-day Ischigualasto trips are worth booking a week or two in advance if you're traveling during peak season. Day tours and shorter treks usually have more availability, but booking ahead guarantees you're not disappointed.

Guided tours make a real difference here. Local guides know which treks lead to the turquoise creeks, they understand mountain conditions, and they can explain the geological story at Valley of the Moon in ways you won't find on signs. Most people book guided experiences rather than going solo.

Renting a car gives you the most flexibility for the scenic routes through the valleys and reaches to trailheads. Many day tours include transport from San Juan town, so if you're staying a few days, mixing self-driven exploration with organized trips works well.

Horseback treks and multi-day mountain crossings suit older kids and teens with riding experience. Day hikes to creeks and valley drives work for mixed ages. Check with tour operators about age minimums and physical demands for specific trips before you book.

Full-day and multi-day mountain tours usually include transport, a guide, and sometimes meals - check before you go for specifics. Stargazing experiences often bundle the guide and telescope access. Shorter hikes may be guide-only, so bring water and snacks.

They're both worth the trip if you have 2-3 days. Ischigualasto (Valley of the Moon) has surreal multicolored rock formations and dinosaur history. Talampaya offers different desert landscapes and rock canyons. Many visitors do day tours to each rather than back-to-back.