It's easy to come here and not see everything. We have a membership and like to come for a few hours and check out different exhibits every time. It's a huge zoo so you can always find somewhere that's not packed. There area also lots of indoor pavilions so you can still see something in winter.
My 4-year-old loves the kid area with the sand pit. We could spend hours there alone. Never tried the water park because it's always packed, but that should be a sign of how good it is.
Was definitely a good investment!