If you choose to attend one production this summer, consider Moonlight’s terrific rendering of South Pacific, the rare musical play that balances saccharine comedy with serious themes and stage craft, and an ocean of memorable songs. Even if you’ve seen the Rodgers & Hammerstein gem before, or the film, or read James Michener’s book, Tales of the South Pacific, which sparked them all, you should drive to Vista to experience this production outdoors, especially when a heat wave makes normally cool nights feel like the breezy tropics.