Kalimpong Science Centre is a modest but useful stop near Deolo Hill, especially if you are travelling with children or need a change from monasteries and viewpoints. Exhibits focus on simple science demonstrations, models, and interactive displays rather than a large museum collection.
Its setting helps. Because it sits above town, the visit can be folded into a Deolo outing, with the science exhibits, outdoor models, and mountain air making a low-key half hour or hour rather than a major destination.