This is to get tickets discounted at $10 per person. Parking is extra. They do have some learning opportunities set up during Homeschool Week so I know this is two field trips in a week, which is a lot but if you only want to come to one and are torn, I’d do the zoo. The aquarium homeschool days doesn’t have anything special set up and it tends to be easier to get discounted tickets there. We will be at both (so long as we stay healthy of course).