Maybe we can share our border crossing experiences and tips here.
I have one
On my recent trip crossing from Canada to the US. I mistakenly took oranges with me. That's a no no. I had a "Agricultural Inspection" done.
So don't try and take citrus to the US.
The US Customs Officers were very polite and very helpful. I knew that I couldn't take Canadian beef etc.
They also confiscated my apples because when we washed them we removed the stickers. As they didn't know the origin of the apples they couldn't let them in.
Not a problem - I now know for next time!