Jaisalmer is the place I liked the most in Rajasthan. You should plan for a minimum of 2 days. Places you should visit - Jaisalmer fort, stay in tent for 1 night and enjoy camel and Jeep safari, cultural show at the campsite, a few popular havelis - Patwon Ki Haveli, Nathmal Ki Haveli and Salim Singh Ki Haveli. You should also visit the War Memorial set up by the India Army near Jaisalmer. Another place is Tannot Mata Temple, which is very close to the India-Pakistan border and is featured in the Hindi movie Border. It is said that this Goddess had protected the Indian soldiers during the 1971 War and even today protects the border.
Hope this helps. 😊