I wasn't in a group. But paid $22 and it was well worth it. The guide we had was amazing.
We paid like $22 per person I think but we weren't on a group tour.
I don't remember how much it cost for us to get in...it was back in June of last year...as long as you listen to your guide on what to do and NOT to do you will be safe.
It's very kids friendly. You can get group discount
It's $15-$20 per person. You may get a discount since it's a class field trip. Better to call and check
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