I LOVE Hojo's and have stayed there numerous times over the years (back when the rates were significantly less). The water park area is great if you have little ones and the grounds are very pretty. I like staying in the buildings that have interior corridors.
We stayed at Castle Inn last November in a family suite. I loved having the two separate rooms and feel like the walk was about the same distance as Hojo's. We did have some noise outside our room one morning, with people standing around talking outside our room, but of course that can happen anywhere. But it is motel-style with exterior corridors.
Both places were extremely clean. Castle Inn was recently renovated when we were there.
All that said, we are staying at Castle Inn next month as we got the best rate there.