1.Mount Abu Is Must Visit Especially Monsoon Time
2. Jodhpur - Mehrangarh Fort - Ghanta Ghar - Njoy The Beauty Of Blue City
3 . Jaisalmer - The Golden City - Visit The longewala War Memorial - Tanot Mata Mandir - Spend Tbe night In Sam Sand Dunes
I was there in Bikaner for 3 years I would suggest to visit offcourse
1- bikaner and do not forget to try ghewar and small kachoris .
2 - Deshnok - here is the temple Of karni and you will find hundreds of rats in the temple . that temple is bit different from others 3 - Ganga Nagar
I am sure you are aware of the basic places to cover...such as jodhpur..Jaipur...udaipur...but if you want something little less mainstream..try mount Abu. There are few short hikes and nature trails that take 2-3hrs...Also some clubs carry out family outings as well.