Come to the West Side Market, stay in the area for a while and visit. Seriously, just come here. It is in a beautiful old building as well as a couple out buildings and contains some of the brightest colors of produce around. Combine that with unique ethnic goods, bakery items, and just general atmosphere and it becomes quite the experience. It is always PACKED to the brim with people so be ready for that.
Parking is iffy, but free if you can find a side street to park on. You will want to park somewhere free, because the whole area is pretty cool to walk around. Definitely hop to a couple of the bars and have some microbrews before or after your shopping trip at the market.