Well, I'm not sure if this is what you want, but I know that Seaworld in Texas has two major coasters, Great White and Steel Eel. Seaworld in Orlando has the Kraken floorless. BGT and Great Adventure both have coasters as you know and do very well. Marine World has Medusa, Roar, Kong, Boomerang, Cobra and Roadrunner. SFMW gets plenty of attendance. Surpassed PGA in the middle of the season and didn't look back. I'm not sure about Seaworld. As for zoos, I know that near me, the Oakland Zoo in Oakland, CA has a small family rollercoaster, and the attendance was enough the last few years to allow that to be built, so I'm guessing it's good. That's about all I know. :)
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My Karma Ran Over My Dogma