The Nature Trail is a lovely, easy 1.5 mile loop with a lot of placards describing different trees, which is interesting. You access it by walking farther up a road that goes off the main parking lot, where horse shows are held. Just stroll up about a tenth of a mile, or so, to trailhead on right.
This is a nice park to explore when you don't have time to make it up to the mountains. You can get a good workout in and the lake is very pretty. There are a lot of horses on the trails which means you need to constantly be on the look out for manure.
Croft State park trail is a good trail in the foothills near Spartanburg. Hikers, bikers, and horses can be there with some restrictions. They have horse shows every third Saturday and there are facilities for horses. There are streams to get wet in and interesting landscapes. The trail tends to wide and may be better for bikers. It goes between two lakes with muddy bottoms that are not good for swimming. I saw a couple of canoers there. The lake is a nice scenic view. I saw no one on this moderately strenuous trail. The trail is well marked in several places. I got off on an unmarked trail by accident but managed to get back on the main trail and go in the right direction by looking at the trail map and taking note of the radio tower. There are a lot of cobwebs on the trail and I maneuvered carefully around a black snake. There is a restroom with flushing towels and a shower. I used regular shoes to hike it, but hiking shoes are recommended.