From the east: Follow the M4 until its western end then follow the A48 to Carmarthen. At Carmarthen follow the A40 to Haverfordwest, passing St Clears. After Whitland, continue on the A40 for 11 miles (15-20 minutes). You will pass Narberth, Robeston Wathen and Canaston Bridge.
Turn right (signposted Wiston, Clarbeston Road and Llysyfran Country Park) about 3.5miles west of Robeston Wathen. (If you reach the Sytner BMW garage you have gone half a mile too far.)
Drive up the country lane for 0.6miles. Turn right AFTER the cottages. Quarry Park is on your right after 300metres, and is marked by a sign on the stone gateposts. (If following a SATNAV it may advise you to turn right to 'Storage 4' but don't - there is no access down that lane).
From the west: from Haverfordwest follow the A40 towards Whitland / Carmarthen. 5 miles from Haverfordwest you will go up a long hill (Arnolds Hill). After this, you will pass the Sytner BMW garage on your left. Take the next left (signposted Wiston, Clarbeston Road and Llysyfran Country Park) and follow the directions as above.