I would suggest you to go on a short trek if you like mountains. For example, Triund trek that starts from Dharamshala.
You can also go to Bir Billing where you can trek to Billing and have an experience of Paragliding. Apart from that, hiire a cycle and visit the monastery. It's a perfect 3 days trip. If you are not interested in mountains much then travel to Udaipur via train. The weather currently is the best to visit the place.