If you like history, you will enjoy Montezuma's Castle. It is only $5 to get in - free for seniors - and it is well worth it. I don't know if there is a volunteer there every day, but the gentleman that was there when we were, had a very in depth knowledge of the history not only of the peoples that lived in the cave dwellings, but of the restoration efforts of past and present. There is a very easily walkable path that passes in front of the dwellings and the river, also wheelchair accessible. The path is not long, you could easily do this in about half an hour. There is also a display in the entry building with history of the dwellings and the restoration efforts. I thought it was pretty good. They kept it pretty simple, but the information is still very interesting and doesn't overload you with reading. . You can go through the displays in about 20 minutes and still read everything. There were quite a few kids there and it appeared that even the kids were kept interested.
Make sure you pop in to Montezuma's Well, too. There is lots more to see and there is no fee. Montezuma's Well would probably be better with a guided tour. While there is lots of signage, there is even more that is not explained. We had a guide who was an archaeologist - amazing information! There is also a concrete pathway at the Well, and it is also wheelchair accessible. There are steps that go down to the bottom of the well, and one that goes almost to the river. Obviously not wheelchair accessible, but as long as you are reasonably mobile, it is not a strenuous climb. These two historic sites are worth a visit, and I think even kids would be interested. There are restroom facilities at both sites.
This review is the subjective opinion of a TripAdvisor member and not of TripAdvisor LLC.