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Right now the weather is not good for traveling you can wait for some days and visit in april that's the best time,if you travel now you'll miss so many good places..
In my opinion must ones - jagdish temple
neemach mata mandir
city place, lake pichola
Fateh Sagar Lake
sajjangarh monsoon palace optional ones- vintage car museum
bhartiya lok kala mandal
ahar museum and cinatophs
saheliyon ki bari
Many tourist attraction are in Udaipur.For religious buddy Nathdwara is worth visiting. It is only 50 kilometer away. Temple opening timings are 5O'clock in the morning,9o'clock,12O'clock,3.30aternoon and then 6in the evening.Little bit difference is there in winter and summer timings.Haldighati is only 10 Kilometres from this place. one day can be utilise to visit these places. Evening can be spend near Fateh Sagr Lake. Second day one can explore vintege car musum,Pichola leke,temple situated on hill top by cable car, palace dinner at Lake palace.
Solo was better when there were buses running from Delhi to Spiti. Just check after March if they are there yet otherwise joining a group is always better.