After trying this shot a few weeks ago (and failing due to an incorrect aperture value) I ventured back to Lake Joondalup in Wanneroo to try again. I think I got it this time!
Sigma 10-20mm f/3.5 @ 10mm
1/8s (0, +/- 2.0 EV, handheld)
Merged with Photomatix Pro 4.1.1
Further alterations with ACR 6.7