The Denver museum had a free day once, and I went with my wife. It was full of the shittiest, rudest, most ignorant people I'd ever seen. A 9 year old, while looking at a goddamn T-rex skeleton, directly in front of him, turned to his buddy and said "I don't believe in this."
This shitheel deserves every person that walks through his doors.
The Oregon Museum of Science and Industry had a free Bodyworlds Day so I went. They always have Von Hagens's plasticised fetuses on display on the upper level, or have since 1993 or so, so I'm used to seeing it I since I was a kid I guess. But oh the complaints. Like you didn't know what you were getting yourself and your kids into when a simple google search and the nice person at the counter tells you that yes, there are real dead bodies and now your kids are traumatized. You just saw "free."
I remember once I went to the San Diego Museum of Natural History and they had a Creationist school come out and walk around to compare and contrasts (points for showing both sides of the story I guess). I just remember one girl looking at some chart of the how the Earth as we know developed and she just said, in her schoolgirl best, "But the Earth isn't bllions of years old, only thousands."
The Peabody Museum never has free days... unless you're a Yalee. Which is strange, because if you go to Yale, paying nine dollars to get into a museum is going to mean nothing to you.
Anyway, we don't have any creationists, because we're not dumb.