For this long exposure shot I used the rocks in the sea as a counterpoint. For the lens I used the 24-105mm at the long end. Again the key is to focus on manual before attaching the ND filter. If you don’t have a camera release cable then set it for a 2 second delay; this helps to reduce any camera shake. For post-processing I used Nik Software’s Silver Efex Pro 2. You can use this plugin either directly from Lightroom/Apple Aperture or Photoshop. Topaz Lab’s have a great BW effect plugin too and its worth checking-out too. The ability to select film types with Silver Efex Pro 2 enables you to very quickly produce natural black and white results. 
These tools helped me work the magic:
amazing long exposure work! i prefer for landscapes long exposure than HDR
you work is amazing!
Thanks a lot! I visited your web site,too. I love all of your black and whites, I want to get better at those.