Actually I think the secret is probably a total let down. The MI games are (potty) humour kids games (which nobody in my country due to lack of language skills realized, and it felt much more mature and cooler than it was intended)
Well it is all theme park style (not too surprising since it was inspired by the pirates of the caribbean ride). MI1 : map seller, MI2: parents picking up the kids, alleyway like the alleys in MI1