Do tell us more about what they families did together. They were granted more private time.
Gift exchanges were the norm. I'm Sure they all hold important meanings.
Any of them stand out?

Well, I could see that most families brought pictures of the past, which they would look at and talk about the years gone by.
They'd also take pictures together with polaroid cameras so they could exchange them right on the spot.
A lot of them also exchanged their phone numbers and home addresses so they'll be ready to write to each other in the future -- if that ever becomes possible.
The South Korean families mostly brought daily necessities, clothing and food like ramen,... but aside from these presents, it's really the letters and photos these people find meaningful.
We could see quite a number of North Korean participants tear up after reading letters from their grandsons or daughters from the other side of the border.