Yesterday I posted a comparison between a CPL filtered and un-CPL'd photograph and how using a Circular Polarising Filter can improve the look of your photographs during the day when the sun is shining.
But now I'm going to show you a photograph taken from the same spot (almost exactly) but that has a whole lot more "wow" factor simply because of the time of day it was taken. I took this photograh about 55 minutes or so after sunset but while the sun was still giving plenty of golden glow to the sky. The foreground is also lit by the street lights which kind of matches the colour of the sky, and also prevents the foreground from just being plain black.
Of course this required me going back to the beach much later and dressed a little warmer, but I think the results were well worth the effort!
At this time of the day colours are super saturated and beautiful. However, because the light is nowhere near as bright as during the day shutter speeds are way slower than while the sun is shining so a tripod becomes essential. I used f11.0 and let the camera choose it's own shutter speed which was a full 30 seconds in this particular case. A bit of playing with sliders in PSP X5 lowered the highlights, raised the shadow areas and increased the saturation some more until I got what I was after.
Nikon D90 and my trusty el cheapo 18-105mm kit "plastic fantastic" lens.