Some pics from my ride today- Cochran Mill Park in Chattahooche Hills GA. This is my favorite 'local' trail- it's second closest to my house, about a 30 minute drive. It's also only 18 miles from the Atlanta airport. This area has (or had, at least until recently) very little development despite being so close to the airport, and is a bit of a mecca for road riders. The park has been here for years and had several trails and roads, but in the last few years they allowed a local group to build new trails which are much better for biking.
If you're a fan of The Walking Dead, part of the episode "Chupacabra" was filmed in the park- the scene where Daryl's horse gets spooked by a snake, and he falls down the hill into a creek and stabs himself with a crossbow bolt. That's on one of the older trails (just a road, really) which isn't much fun on the bike.
This is on the Yellow trail. Lots of granite and roots and some decent climbs, but nothing super steep or long. Mostly lots of up and down, sweeping turns, and a lot of fun. There are big rocks/small boulders sticking up from the soil everywhere, and the trail runs next to and over several. Most of them can be used for ramps if you're up to it. There are some larger rock formations, especially on one of the hills, but I didn't get any good pics.
The park area used to have four or five old mills. None of the buildings remain, but there are two dams and several waterfalls. There's not usually a ford or crossing here, but the creek is down a bit and it would be easy to jump across in one spot.
This is another one of the falls, on a branch of the creek a few miles upstream. The pic is from back in the spring- a bit more water then.