My family did the penguin tour on Friday. My daughter is 7.
I did not feel it was a good value. They gave us a discount because we also did the Dolphin Tour and we had a quick-que, and I still didn't feel it was worth the cost.
The tour starts near the sea lions/seal exhibit. You walk behind the scenes and into the backstage area of the penguin habitat. You stand in a hallway and look at some posters on the wall while they tell you about the four types of penguins you will see.
They then take you into the back of the exhibit. The area you stand in is about 10-15 feet long and maybe six feet wide. Our group included about 15 people total. It was very crowded and you can only see straight out in front of you (there are walls on the other sides). The person giving the tour even said, "This is going to be a small area and we will all need to work together to make sure everyone gets some time near the front of the area to pet the penguin".
Since we were there for my daughter mainly, I just stayed near the back and let her be up toward the front. It was very dark, so not great for pictures.
We spent about 15 minutes in that area each taking turns petting the penguin and asking questions. It may seem obvious, but - It was very cold - so make sure to bring a sweater or light coat since it is 32 degrees. There was one person on our tour with just a t-shirt and shorts and he looked very cold.
My daughter was VERY happy about petting a penguin, so I am glad we did it for her, but I would recommend just sending one adult with the child and save the tour cost for any other adult unless that adult really wants to also pet the penguin. Although I thought it was cool, I certainly didn't feel it was a good value.