By Daniel Kline A classic Las Vegas has property has followed Fremont Street’s Circa in making a big change. In the mid-1990s Las Vegas made an ill-fated effort to market itself as a family destination. That move made some sense, as the city does have a sort of overgrown-theme-park feel, In fact, the then-new MGM Grand casino/hotel had an actual amusement park built on its property to give kids something to do while their parents were gambling. At the time, Las Vegas was feeling pressured as more areas of the U.S. offered legal gambling. The city responded by having the Las Vegas Convention an…