Take exit 11 for Imlaystown and go south. At the stop sign at RT 526 (t intersection), make a left on 526 and the a quick right on Imlaystown Rd/Davis Station Road. Then make a left on Emleys Hill Rd (third left?) and maybe a mile up the road the park entrance is on your left.
Clayton is super fast and only a tad of roots but mainly just fast fast fast. Does get sandy and I would think right now some spots might be bad. The loop is kind of short (maybe 5 miles and some connecting trails) but there are fun downhills and some good log rides too.