There are 5 (or 6?) "Sea World" parks around the world (even one in Dubai), but Sea World San Diego was the first! It opened in 1964; today's pictures are from 1966.
How about a nice penguin show? Sure, why not! Penguins are the most lovable birds ever. Go on, name a more lovable bird. Parrots? Don't make me laugh! Canaries? All that tweeting drives a person crazy. Chickens? Delicious, not adorable. I rest my case, your honor. As you can see, there was a tropical (?) pool with everything a penguin could possibly need to make a fabulous show - that is, if they needed a slide.
And finally: a penguin going down a slide. It was all worth it, wasn't it?