We stayed at the Big Spring Campground for a quick weekend away. Only 2.5 hr drive for us. The Big Spring is really an impressive sight. 

The NPS Staff was very friendly and did not mind all my questions about the park or spring or wildlife. They had a presentation in the Amphitheater while we were there but missed it cause the kids were just enjoying running around so much. 

Short hikes on some maintained sand trails from the campgrounds to the river. I regretted not bringing my water shoes for the river, rock bottom.

The whole place looked well maintained, some of the back campsites possibly under renovation. We were in the 400 loop and they had new fire rings with gravel pads around them installed recently. 

Plenty of deadfall to collect for firewood which was great since you cannot bring in your own firewood.