Gwen Stefani, Kingston & Zuma: Park Playtime!

Gwen Stefani takes her boys Kingston and Zuma out for a sunny day at Griffith Park on Friday (December 23) in Los Angeles.

The 42-year-old rocker took the boys on a miniature train adventure – Kingston and Zuma were all smiles, waving to people and laughing on the ride.

PHOTOS: Check out the latest pics of Gwen Stefani

Earlier in the week, Gwen, Zuma, and Kingston were joined by dad Gavin Rossdale for a family trip to the movies to see Alvin and the Chipmunks: Chipwrecked!

10+ pictures inside of Gwen Stefani, Kingston, and Zuma having a ball at the park…