We've stayed at both Clute Park and the KOA. Clute is nice because it's right downtown, across the street from a really nice park and walking distance to a Walmart. The sites are a little close but not awning-to-slideout close.
The back sites at the KOA are very nice, with cement pads and patios and away from the road noise. It is right next to railroad and trains do come through at night.
Check the race schedule at The Glen. The KOA is within earshot of the racetrack. The weekend we were there, there was no race but there was still noise from the track.