I'm going to be in Philly on a Sunday (soon) with two adults and three kids (7-13 years old) and I'm wondering if there's something or some place that's a must there. Could be lunch or dinner. Could be cheese steaks. Could be something I haven't imagined. The kids are adventurous eaters, so that's not an issue, but I'd like a place that's casual and fun. Any ideas would be most welcome. Thanks.