Went hiking here a few days ago with my 7 and 10 year old. Admission is $5 for over 12 years old, and $2 for under 12. We hiked the Northern Loop Trail (1.9 miles), and the Southern Loop Trail (3.4 miles). Both trails were easy and relatively flat. There's a playground, and you can get a map at the office. The rest room by the office was clean enough. You can exit the park, and come back in the same day as long as you keep your receipt. There were more challenging trails, but I didn't want to overwhelm the kids. The trails we hiked were marked well, so it was easy to stay on the right path. Would love to visit again when in the Huntsville area.