We have a family tradition of stopping at this Ghirardelli location every time we are in Chicago. It's always hard to find a seat (especially for a family of 4), but persistence pays off as there are always customers coming and going. Ice cream sundaes (highly recommend the Lands' End with brownie, ice cream, fudge, caramel, and sea salt) are big enough to share and that helps offset the $10-15 price for a special occasion.
Plenty of choice in chocolates, if you're in the mood for candy instead of (or in addition to!) ice cream specialties.