Still hip, always packed and innovative after more than 25 years, Rick Bayless' top-notch River North Mexican draws 'em in with perfectly constructed gourmet dishes elevated by creative and novel flavor combinations and further boosted by powerful but refined margaritas; helpful staffers work the colorful, art-enhanced digs, and even if reservations are tough to come by and you could have a birthday waiting for a table, it remains a perennial favorite that fans say belongs on eveyone's bucket list.