If you have five days and want the cities that define Rajasthan, this is the route: the Pink City of Jaipur, the fort-crowned Blue City of Jodhpur, and the lake city of Udaipur.
It starts in Jaipur, so you can arrive from Delhi by road or on a short flight, and ends in Udaipur, which is well connected by air. Two nights in Jaipur, one in Jodhpur and one in Udaipur keep the pace brisk but not breathless, with the long Jodhpur to Udaipur day broken at Ranakpur.
It is deliberately focused. If you would like more time, our 7 day Rajasthan tour adds Delhi, Pushkar and a second night in Udaipur.