Our family (kids 8 and 10) moved from Waikoloa village resort to Zoe's place, which is one level summer house surrounded by beautiful trees. There is enough open space to play soccer. Everything in the house is well thought out, and taken care of, providing nice comfort feeling. There is a library of books, dvd's and table games. You only need to bring grocery or Zoe can provide meals. She is a caring person and quick to answer any questions. If you want to explore both volcano park and east coast in a retreat like setting it is difficult to find a better place.
Other things to consider. At night you can hear frogs singing (I personally liked it). Road to the house from the highway takes about 4 min, and part of it is unpaved. I do not find it problematic, but SUV will provide better experience, and that is true in general if you want to explore the island.