Some of the most popular retreats in California include yoga and wellness retreats, meditation retreats, creative writing retreats, and outdoor adventure retreats. These retreats may include accommodations, meals, activities, and workshops, depending on the retreat's theme and focus.

For example, a yoga and wellness retreat in California might include daily yoga classes, meditation sessions, and healthy meals prepared by a professional chef. A meditation retreat might feature instruction on different meditation techniques, guided group meditations, and time for silent reflection.