Visited Jaisalmer last month and the only reason I tarveled 800 kms from Delhi to Sam was to just see dunes, as I have never seen one (Only in movies). So after reaching Jaisalmer railway station we hired a cab and traveled 60 kms away from Jaisalmer and reached SAM.
Sam is an amazing place. Its a radius of 4-6 km which is just small sand dunes with an approx height of 60 mts.
As per locals I must visit these dunes in winter as August is quite hot that even the hoteliers don't run these hotels in these months.But when you are here its impossible to not visit this amazing destination. Will definitely visit Sam in December.