There is a lot to see (sea life and animal exhibits), but they have room to improve in multiple areas. Maybe pave the more main pathways instead of everything being dirt? Start accepting credit cards for snacks, meals and rides? Improve the bathroom situation? Add more signage?
For $40 per adult (and extra charges for every other add on), I would expect just a little bit more..polish?
Get the Groupon for $10 off and go when it's under 80 degrees out, or else you're just walking around in a hot dirt cloud in between exhibits.