Families can pick up a free fun-for-all-ages Junior Ranger Activity Booklet at the Furnace Creek visitor center, which has info-packed handouts on all kinds of activities, including hiking trails and mountain-biking routes.
The best time for hiking is November to March. Stay off the trail in summer, except on higher-elevation mountain trails, which are usually snowed in during winter. Constructed paths are rare in Death Valley and all but the easiest hikes may require some scrambling or bouldering. An adequate water supply is essential; one gallon per day per person in summer and half a gallon in winter are recommended.