The Sam sand Dunes are 42 km from Jaisalmer, here you can hop on to a camel for an hour around sunset and then get back to your comfortable hotel or else find a fancy tent to stay in for night. Or you can ride for days with only a camel driver for company and the most basic provisions. The best option for reasonably hardy travelers is a 2-day safari with one night spent under the immense canopy of the desert sky.