The Biosphere 2 is a very interesting tour. They mention 100-150 steps - that is NOT all at once. It is just that the entire tour has steps here and there, more like 10-20 at a time. So little kids are perfectly fine during the tour also. They had about 15 people in our toured group. Part of the tour is outdoors and part of it is indoors, so pack sunscreen if touring in the warm months. Make sure you have eaten before you go. Make sure to take water bottles because they do not stop for anyone, and you cannot return to the main entrance without them radio-ing for an escort. This is because the tour takes you quite far away from the entrance and into tunnels here and there. There is a small snack shop / restaurant near the entrance. It is an experience that is great as a day trip.
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