A ranger-led tour of the ranch includes the colorful story of the 60 years Bill and Frances Keys spent working together to make a life and raise their five children in this remote location. After years of neglect, the Park Service, with the help of some dedicated and resourceful volunteers, has restored the ranch much as it was in 1969 when Bill died. The ranch is tucked away in a secluded cove near Hidden Valley, and can only be visited on a Ranger-guided tour. Check at Visitor Center for schedule.
More information is available here.
The Oasis of Mara, located right next to the Visitors Center in Twentynine Palms, is most easily acessible and also offers a short interpretive walk. The 49 Palm Oasis is just a short drive west of 29 Palms, and can be reached by foot on a 4 mile hike that leads high into the mountains and offers great views of the desert floor and city below. For those looking for a longer hike, eight miles round trip, and the largest stand of fan palms in the park, the Lost Palm Oasis trail starts at Cottonwood Spring, near the south entrance. It is easily accessible from the parking area on a short nature trail. Cottonwood Spring Cottonwood Spring Oasis, one of the best kept secrets in Joshua Tree National Park, is just seven miles from the southern entrance to the park.