Its facilities include a baseball complex (home of the Union Park Little League) with four baseball fields and one softball field, a fishing dock, two rentable pavilions, a water playground (The Splash Pad), a seasonally lifeguarded lakefront with a swimming area, a skate park, a basketball court, picnic areas, and two playgrounds.
In 2023, Orange County announced plans to build 10 pickleball courts at Downey Park.
Held the second Saturday of each month, Teen Hype Night has won awards for its innovative approach to providing youth with safe opportunities for recreation.
The park's flagship event, Santa's Wacky Wonderland, is held in December of each year.
The event provides activities for elementary school aged children and includes a variety of inflatable games and crafts.