Keep your eyes peeled at Sapporo Jyogai Market — you're likely to come across some treasure or funny trinket in one of its many stalls. After you've had a thorough browse of things, grab a bite to eat from one of the nearby food vendors.
You'll have no end of sightseeing choices when in Chuo-ku. Sapporo Jyogai Market is a good place to kick off here, but there are numerous other worthwhile sights to check out. Sapporo JR Tower, Sapporo Beer Museum, and Odori Park are not far from the community marketplace and will fill in your day nicely.