A great place to spend the day is The Jefferson National Expansion Memorial Park. After parking in the "Pay for parking garage", you may want to go directly to the Arch ticket window and get your tickets. You may have to wait, and sometimes the wait can be long. If you have to wait, enjoy the museum, or take a walk around the spacious, well kept grounds.
You will enjoy taking some photo's of the Mississippi River, the trains going by, and the St. Louis skyline. You will be able to walk to the "Old Cathedral", the "Old Courthouse", or a Cardinal game!
You also can use the Metrolink, the light rail system. You can stop at Laclede's Landing and enjoy the varied shops and dining establishments in that area.
Prepare yourself for a "Fun" day and enjoy the view from the top of the Arch!