Follow these basic but essential steps for capturing epic photos at Thor's Well:
Time your visit so high tide and sunset coincide. Use a wide-angle lens. 15-24mm range for full frame (10-18mm APS-C) Use a sturdy tripod. You cannot get the drain effect without a slow shutter speed. Shoot in Aperture Priority at F20 & ISO100. Use a Circular Polarizer (CPL) or ND Filter to allow a slow shutter. Set your camera to a 2 second self-timer or use a remote to avoid shake.
For best results, consult the photography section of this ultimate guide for other factors and considerations to be aware of.