Shania Twain truly is Still the One. Her greatest-hits show is glitz and glamor and heavily incorporates the audience. She’s active in the community (she opened a kids club in North Las Vegas and was the Great Santa Run grand marshal). She’s everything one could ask for in a Strip headliner. The Colosseum at Caesars Palace, 888-929-7849. July 18-19, 22-23, 25-26, continuing residency, 7:30 p.m., $55-$250.