Thanks for all the compliments!
For that first picture, I tried to save the sky but noticed some unpleasant artifacts starting to show up and decided to just go with being over-exposed. I have a similar shot of the scene which I did take 5 exposures of and I will try to work with that and see if I can get a better outcome.
I liking the waterfall the most as well! Nice going, mind sharing what software you used?
I imported RAW files shot at -1, 0 and +1 into Aperture and then click-dragged them into Photomatix. Since I used a tripod, I opted to not align the source images or reduce ghosting artifacts, and used the tone profile as supplied.
In photomatix, I basically played around with the setting until I found something that clicked for me. I used Details Enhancer for every picture, and worked the strength, saturation and light smoothing to find a good base to work with. After that, just tweaks for the black and white point to avoid clipping, and a bit of micro-smoothing and maybe some S/H smoothing.
After I'm done in there, I export it to a 16 bit TIFF and bring it back into Aperture. There I fine tune the exposure, vibrancy, contrast and set my levels. If needed I'll tweak a specific color hue or saturation and tweak the highlights or shadows.
When it's all done, sharpen it up and give it a name!