Keep an eye out at Kabootri Darwaza — you're likely to come across some treasure or funny trinket among the stalls here. After you've admired the wares, grab something to eat from one of the local food vendors.
This community marketplace in Gurdaspur comes recommended by travelers, so make a spot for it on your schedule. Don't think the sightseeing ends there, however. There are many more attractions ready for you to check out after Kabootri Darwaza. Government College, Jhulna Mahal, and Fish Park are not far away.