Because I started with a lot of files that were just licensed for non-commercial use, those are what they are...day and night are the same.
Until I get a lot of travel under my belt, mine will also be the same day and night, as Mrs. Cobb and the pups won't sit 12 hours in the same spot just for me to get a pix...grrrrr!

We'll be making follow up trips to places and taking evening shots eventually. Michigan is just emerging from lockdown and I can finally start roaming again.
The DS. Store files are a Mac OS thing, and I totally forgot about them. They're junk, and you can toss them away. I'll try to eliminate those in the future...learning curve for me.
Yes, my boxes are much higher resolution. That shouldn't cause issues, and hasn't in my test runs.
As for getting just sand, after you create your model, go to the part of the ballpark editor shown in this pic, and change your current view from construction kit to wide. That should do the trick.If not, let me know and I'll get on it.
When you're in-game, you also can control which cameras to use, see 2nd pic for that menu.
Welcome aboard!