Tempe Diablo Stadium is best known to travellers as the spring-training home of the Los Angeles Angels. During Cactus League season, the ballpark gives you warm afternoons, close-up baseball, and a more relaxed atmosphere than a regular major-league game.
The appeal is seasonal, so it only makes sense from late February into March. If your trip lines up, book ahead for popular opponents and treat it as part of the wider Phoenix-area spring-training circuit.