Hey Shivani, Affordable two days trips near Delhi are :- Neemrana Mathura in Uttar Pradesh Agra haridwar and rishikesh Corbett National Park Lansdowne Alwar in Rajasthan Mussoourie Nainital Shimla Chopta Narkanda in Himachal Pradesh Amritsar in punjab Dharamshala in himachal Pradesh Munsyari in Uttarakhand Kasol and Manali in Himachal Pradesh.... Happy Travelling!!!
Hey Shivani, Best is go to Jaipur. En-route to Jaipur (If you go via Dausa) you can go to the Bhangarh Fort (most horror place in India). Spend one night at Jaipur. Next day wake up early and cover the points in Jaipur and return back to Delhi till night . For the points to be covered in Jaipur;read my post (Things to do in Jaipur ). You can ask any query related to above.
Rishikesh and Mussourie is the best bang for the buck. just don't stay at Mussorie and use public transport. You'll be surprised you can manage between 3k to 6k.