12 hours in Warsaw during our

My wife and I are going on a trip and we got 12 hours to kill in Warsaw during our layover. What are some must things to do in the city. There’s a lot of content online but we don’t want to fall for any tourist traps. We love architecture, nature, art, etc… We’re going on a soft, slow paced romantic trip and we’re trying to make the most out of it, would love your help!