I had the Groupon for all three pyramids, two of which I had been to before. The aquarium and the rainforest are really nice, although neither is really that big, so they take about an hour each. The music pyramid is an okay concept, (it's all about the physics of music) but a lot of the instruments were WAY out of tune and not really presented in a way that a lot of people would understand. My daughter just ran around poking at stuff and not really learning anything. All of the pyramids are expensive. Our less than 3 hours of fun would have normally cost over $100 if we had not had the Groupon. If you have to choose one, I'd choose the aquarium.
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