The basic idea is to put on your layout what you love.
For those of you who love baseball, if you have the space, I strongly recommend that you put a ballpark on your layout.
With the excellent scenery materials and baseball figures available at affordable prices, it's a no brainer to do this project. You can also add bill boards, light towers, bleachers made of Popsicle Sticks (available at arts & crafts stores), and standing and sitting figures (the fans), to make your ballpark more interesting. The cost of this project is a small fraction of most locomotives.
Most importantly, you will have fun creating your ballpark, which you can admire and share for years to come.
Besides, my ball players are tired of playing their games on the same field, and they crave playing games at other ballparks. LOL, Arnold