You could, but would be a pretty long day for a 4 year old. The zoo is a solid 3/4 hours and the Aquarium is another 1/2 hours. Add the drive between the two and it would definitely be a full day.
It might be doable, but they are not near each other and it's no fun rushing through
Thank you all. We wound up just going to the Zoo. We got there around 130 and stayed till close and they loved every minute of it. No meltdown at all.
I wouldn't with a 4 year old. Lot of walking at both. Buy the membership or group ticket and go to each in its own day. It will wear out an adult.
Thanks! Your answer is awaiting moderation.