We visited Craters of the Moon with our 7 month old baby. It is a great walk around a geothermal area with viewing platforms for craters with mud and steam. The first loop is an easy walk with gravel and boardwalk paths that was very manageable with our stroller. The second loop is steep and has steps but we managed with the stroller with a bit of lifting. You get a view of the entire area and views out to Taupo from the lookout at the top. Very reasonably priced.
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