These are just small hills along a very nice trail. They are good for kids as long as you can get to the trailhead. The road is pretty rocky and would be a bit sketchy in a low-clearance car. An SUV with decent tires is fine. The leaves are down and the views are pretty good at Lower Round Top. No water along the trail. It's about five miles to do the whole loop, marked in blue blazes, and can be done in a mountain bike.