Start the day at the Gateway Arch, the iconic symbol of the city. Take a tram ride to the top of the arch for stunning views of St. Louis and the Mississippi River.
After the arch, head over to the City Museum, an eccentric and playful museum with interactive exhibits, a 10-story slide, and a rooftop Ferris wheel.
For lunch, head to the Soulard neighborhood and try some of St. Louis' famous toasted ravioli at the Blues City Deli.
Spend the afternoon at Forest Park, a large park that houses several attractions including the St. Louis Zoo, the St. Louis Art Museum, and the Missouri History Museum. All of these attractions are free to the public.
Start the day at the Cathedral Basilica of Saint Louis, an ornate cathedral with beautiful mosaics covering its ceilings and walls.
After the cathedral, head to the Delmar Loop, a vibrant and diverse neighborhood with plenty of shops, restaurants, and entertainment options.
For lunch, try the famous St. Louis-style pizza at Pi Pizzeria.
Spend the afternoon at the Missouri Botanical Garden, a beautiful and expansive garden with a wide variety of plant life and several themed gardens.
Start the day at the Anheuser-Busch Brewery, the largest brewery in the country. Take a tour of the facilities and learn about the brewing process.
After the brewery, head to the historic Soulard Farmers Market, a bustling marketplace with a wide variety of fresh produce, meats, and baked goods.
For lunch, try some of St. Louis' famous barbecue at Pappy's Smokehouse.
Spend the afternoon at the Citygarden, an urban park with sculptures, fountains, and beautiful landscaping.
Start the day at the Museum of Westward Expansion, located beneath the Gateway Arch. Learn about the history of the westward expansion and the Lewis and Clark expedition.
After the museum, head to the Central West End neighborhood and explore its charming streets lined with historic homes, trendy shops, and great restaurants.
For lunch, try the famous toasted ravioli at Mama's on The Hill.
Spend the afternoon at the Saint Louis Science Center, a museum with interactive exhibits, planetarium shows, and an outdoor science playground.
Title: "Exploring the Gateway to the West: A Four-Day Itinerary in St. Louis"