I have a family pass for the Vancouver Aquarium (and used to work there also), but I must say if your trip is just about herps you won't be satisfied with spending near $20 to get in. They have a couple of herps, mostly in the Amazon exhibit, but this facility is about fish and aquatic mammals.
There are a couple of decent pet stores to go to, (King Ed's comes to mind) but you might want to PM ReneeD for more info. Also, if you are looking to buy something Renee has bred "a ton" of various lizards and frogs this year.
Paul, they still have Beluga Whales, but the Killer Whales are long gone. And, there is alot of public pressure to not only "remove" the Belugas but also the White sided Dolphin.