You will want to take plenty of pictures of everyone there and make notes of the date, location, and subjects so that you can label photographs later. In the course of your research, you will likely visit many places associated with your family. An obvious one, of course, is the cemetery, where you will photograph and document the inscriptions found on tombstones and other markers. These pictures become part of the documentation of your family's life and add another perspective to your understanding of your ancestors. A photograph of the building in which my great-grandfather operated his mercantile store is a reminder to me of what that type of retailing was like at the beginning of the 20th century, and it helps me understand more about his working life.
Every family has special possessions that are treasured.
As the owner or custodian, you may see the family Bible or a keepsake porcelain figurine on a daily basis. For insurance purposes, you may want to make a photograph or videotape of these family treasures. However, you may also want to take a photograph to include in your genealogical database. And never underestimate other family members interest in the treasures you have in your possession. They might like to have a photograph for their photo album.