Gwen Stefani took her sons Kingston and Zuma to check out the rides in Central Park in NYC on Friday. Zuma beat the heat by taking off his shirt to check out the swings. Gwen treated Kingston and Zuma to Popsicles to cap off their Summer afternoon in the big city. Kingston was showing off some blue hair earlier in the week, though it looks like the dye job was only temporary. Gwen is in New York to promote the new No Doubt album, Push and Shove, which will be released in September. No Doubt performed their new single, "Settle Down," on Good Morning America on Friday, and we'll be seeing a lot more of Gwen and her bandmates as they promote their first release as a band in 10 years.