I spent a quick night at Newton Hills and found the park to be lovely, but it was very busy with lots of families out and about which made for a bit of a loud evening. If you have a family it’ll be a great spot—if you’re looking for quiet and calm, maybe something else. Spots are fairly spacious, but not a lot of privacy.
Regardless, the location is a hidden gem among a lot of farmland kind of in the middle of nowhere. It’s actually really stunning. When you leave, be sure to take the little one lane road out back (from 1E toward the tower)—it’s a magical little drive through the hills the park is named after.
No comments on the bathrooms/facilities as I didn’t use them, but the rest of the park was very cleaned and well maintained.