Do NOT,under any circumstances, go to the Zoo on the Friday after Mardi Gras. Why? Because you will be standing in line with 2000 school children on field trips. Doesn't matter if you have a membership card or not, you will still be part of the total disorganization.
DO send a email to Audubon Institute asking them to institute a new policy of posting online when 2000 school children are coming to the zoo so that you will never ever have deal with the hell again.
DO NOT bring a potty training child to the zoo if they have not mastered #2.
DO tell your potty training child that they cannot pee at noon in the restaurant. It's when they clean the bathrooms.