Hey. Yes you can have a good time in Jaisalmer in 2 days, excluding travel. You can plan your trip like this : 1). Day 1 - Start early. 9:00 am : Jaisalmer Fort (Palace, Jain temple, Museum ) . It will take around 1-1.5 hours. around 1'O clock , visit Patwa Haveli. It will taje half an hour. In the evening you can go to desert camping in Sam.
If you are staying in hostels like Moustache or Zostel. They provide you the package where you can Camp in the desert , enjoy camel ride , high tea, dinner and brekfast (the next day) . If you want to visit longe wala / Tanot mata mandir, you can do that by renting a bike. Here are the recommendations Breakfast : Try Shahi Poha near the fort or Fateh Kachori .
Lunch : Vegetarian option ( Chandan shri near Hanuman chauraha ) Non veg - Milan Restaurant (Near fort area). Happy Tripping . For more details you can follow me on Instagram where i update on daily basis.
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Yes , You can but if you add Laungewala then it may add up one more day. On the way of it there are places for camping. Some places like Bada Bagh and Kuldhara in outskirts but i think that can be covered in two days.