This is truly a unique place. If there be plant nerds or birders in your family, or you want to learn more about the desert, well this is your place. We had the gift of a friend who has a membership so two of us were free and I have a student id so that was great.
We ambled through and stopped for lunch at the patio. The experience could be half-day in length, plus or minus depending on the attention spans in your group. Nice gift shop, but the real treasure here, all of the volunteers who were so knowledgeable and friendly. Mega kudos!