Dalhousie has a good number of places to visit in 3 days Day1 you can head up to Khajiar, Dain Kund, jot which all around some 25–30 km from Dalhousie
Day 2 you can visit Chamba town, the district headquarters.It is a more than 1000-year-old town having some old temples to visit
Day 3 you can roam around Dalhousie town itself. or u can visit Chamera lake and can have boating experience there.
Happy Travelling!!