You should have four days in your hand.
Day 1. City Palace,MotiMagri,Pichola Lake,Fateh Sagar Boat Riding Can go for Handi Craft Shopping.
Day 2. Early Morning Drive To NathDwara It Is 50KilometerAwayFromUdaipur For Darshn Specific Timings Are There.You can get 9Oclock In The Morning.Reach There Before That.Then visit HaldiGhaati And The Museum.
Day 3 After Break Fast Drive To Shilp Gram.That Is Nearly 10Kilometer away From the City.Saheliyon ki Badi Is A Good Option To utilise your post lunch. EnjoyRoof Top Dinner .
Day 4. Vintege Car Museum and Cable Car Ride To The Mata Temple,Surj Pole,Sukhadiaa Circle should not be miss Out. On the top of Everything you will like the way they serve delicious food in NatraajRestaurent Near Railway Station.It Is A Regular Type not Costly.
Prerana has given good detail iternary in case you want to speak with one of the local from Udaipur let me know one of my travel buddy she is from Udaipur itself
Near by location to udaipur ( kumbhalgarh fort (84 km ), Rankapur jain temple 93km ) IN udaipur lake pichola, FS in eveing (fateh sagar), sajjangarh top view etc. lots of.
Day1: Visit Jag Mandir, city palace and watch light and sound show at city palace.spend some time in night at lake pichola and see the ambience at assi ghat from lake pichola.
Day2: Visit karni mata temple using cable car, fateh sagar lake,see sunset from monsoon palace.
Day3: you can eklingji temple around 25 kms away from udaipur, in return you can visit celebration mall,Visit Shaliyon ki Barhi, royal car museum.don't miss culture dance performance at Bagore ki haveli which is very close to pichola lake.There are I think 1 or 2 performances every evening.Buy your tickets accordingly.
Day4:If you have other day at hand, you can go to kumbhalgarh fort or Ranakpur jain temple or Chittorgarh fort or haldighati.All the places are nearby Udaipur.
Happy Travelling!!
On the top, city palace, jag mandir, krani mata temple, sajjangarh fort, saheliyon ki bawri, both the lakes, bagore ki haveli for some folk things in evening and ambrai ghat .Nearby udaipur there is chittorgarh, ranakpur temple. If want something off the beaten path DM me.