Tā shì ge mèngxiǎngjiā, zǒng xiǎng zhe huányóu shìjiè.
He's a dreamer, always thinking about traveling around the world.
Tips
usage
梦想家 is usually a compliment: someone with big dreams who may yet make them real. 空想家 is the critical word for a dreamer whose ideas never touch the ground.
In Pop Culture
大梦想家Dà mèngxiǎngjiā
Saving Mr. Banks
Chinese title of Saving Mr. Banks (2013), Disney's film about P. L. Travers and the making of Mary Poppins.