I'll take early-to-mid 90's Sea World for mine (94-95)- pre-dolphin cove, pre-shark bay. When the dolphins and sea lions performed in the same arena, the ski show ran, the waterpark was a place to chill out and relax the afternoon away, when the Pirate ship loomed at the end of the lake, when Corkscrew's white loops dominated the skyline. When they served drinks with those shitty paper straws but it was a good reason to have them, even though they didn't last the whole cup. When vikings ran the long way, and when Bermuda was looking its freshest. When missing the monorail was ok because the next one would arrive in a few moments, when the train chugged around for a nice way to see the broadwater and relax in the breeze, and when the skyway would stop mid-way for the best view of the gold coast you've ever had.
They had less 'attractions' back then - especially the animal exhibits and such (sharks, polar bears, penguins, but they also used the penguin tank for a shark show too) but you could easily spend the whole day there. Riding the train, monorail, skyway, and lazing by the pool or riding the slides at the waterpark really filled the day. A sum total of about 25 minutes is spent looking at Polar Bears, Penguins, Jellyfish, Sharks etc... like, don't get me wrong, but they've taken away crowd-soaking, time consuming, relaxing attractions, put in mild thrills and 5 minute (if that) exhibits, and there isn't any substance there that keeps you occupied long enough to be willing to spend the day (*unless, that is, you're spending the time in the queues, because its busy, their operations are shit, and there are few attractions present to soak up the people.)....
I wonder when @joz's favourite Sea World Era was...