Just don't bother slogging out to
Biosphere II. I'm sure you've seen a greenhouse before, and if you haven't, then the Eden Project is closer and better. As an experiment it (B2) failed anyway, since the concrete floor hadn't had enough time to cure before they started and completely screwed up the supposedly ecologically representative environment
Agree with all other recommendations, though - especially the sword swallowing huummingbird chicks in their thimble sized nests, fed by adults teleporting from flower to beak. Shows up Harriers and helicopters, that's for sure. Also there are Wile E Coyote and Roadrunner in adjoining enclosures. I never did find the ACME concession stand, though.
At the Titan Missile Museum, once you come out of the final blast doors, note the sign warning of sunbathing rattlesnakes. Just the sort of thing to make your day if the Cold War had ever hotted up, and you had just emerged blinking into the post-nuclear landscape after your 3 months on recycled water and rubber rations.
