If you want to see a show while you're in town, try and grab some tickets at Patravadi Theatre in Bangkok Riverside. Why not take a stroll along the riverfront and watch the sunset while you're here? It's also full of great shops and restaurants, so you can spend the afternoon having a wander. If you enjoy the show and want to see another, National Theatre, Sala Chalermkrung Royal Theatre, and Rachadalai Theatre are not far.