Punjab is warm and welcoming no matter which corner of it you choose to visit. However, Jalandhar doesn't have much to offer in terms of making one experience that bonhomie, unless a plethora of temples work fine for you.
But if you're on your way to a hill station (Shimla, Srinagar, Mussoorie etc) then some interesting stopovers could be the Pushpa Gujral Science City, where one can watch a planetarium show, earthquake simulator, flight simulator, virtual 3D show and many galleries and exhibits. One can never quite leave Punjab without experiencing at least a dash of it's vibrant and hearty culture, and for just that dash, Rangla Punjab Haveli takes the prize in this city. A charming Punjabi village themed resort with folk music playing in the background, the staff dressed in colourful phulkari jackets and tehmat-kurtas, serving mouthwatering Punjabi vegetarian dishes, that could making anyone feel every bit of that old traditional charm. Another such wonder is the restaurant Haveli, with the same lively ambiance and also shops where one can buy traditional Punjabi clothes. For amazing Punjabi non-vegetarian dishes, Baba Chicken is the place to go.