We love going here to have picnics on art hill or just going on a walk. Things to see in Forest Park: Art Museum, Missouri History Museum, the Zoo, and Science Center. The Nature Playscape and Art Hill are our favorite paths to walk. Side note: Walks are best with bubble tea. :)
Things to do downtown STL: Ballpark village (Go Cardinals!), the original Sugarfire bbq location, Brick River Cider Co., Union Station and the Aquarium (cute old train station area!), Anheuser-Busch Brewing co., Rooster (great brunch option!), and Katie's Pizza and Pasta Osteria (toasted ravs are a STL thing).
If you're in town on Saturday morning and looking for something local to do, we recommend trying the Tower Grove Farmer's Market. This market is full of diverse local favorites including Korean hotteok, Holy Crepes food truck, Ozark's mushrooms, spicy hot pickles, Flourish farmstead for refreshing harvested herbal drinks, A-maize-ing arepas, dog watching, art, yoga, and live music.