Thanks for all the comments!!
That particular waterfall is at the O'heo falls, or the 7 Sacred Pools in Haleakala National Park - just past Hana. If you go to the flickr link, there are several of the same falls.
The #2 pic above, sunrise - was taken at the top of Haleakala. Great place to watch the sunrise if you are ok with getting up at 3am
Do it the first day there if you are travelling from the US - much easier. The foreground is way underexposed of course, but truth be told, there is nothing there anyway, just the road up to the parking lot
I have a whole series of these shots, include a 360 degree pano from the top of the volcano that I still have to stitch together - not sure how my system is going to handle 25+ raw files