I found the show to be at its best when all seven of the von Trapp children were onstage and singing. When they began "Do-Re-Mi" in the first act, I honestly never wanted the number to end. The enthusiasm from the cast was contagious. (I will admit to playing that song in my car on the drive home, singing along at the top of my lungs, although not quite as well as the von Trapps, I'm sure.) Equally fun were "The Lonely Goatheard" and "So Long, Farewell" later in the first act.
While all the von Trapp kids were outstanding — especially Sarah Busic as Liesl, the eldest von Trapp child — other standout performances for me included Elan Kramer as Max, a von Trapp family friend; Karina Parker as Elsa, Captain von Trapp's would-be fiancee; and Haley Castuera as Mother Abbess, Maria's mentor of sorts at the Nonnberg Abbey.