Hi Terrance,
If you consider India the probable location please get in touch with me at my email ID venum05@gmail.com or to know more about me please log on to http://www.apus.co.in. I have nearly 50 years of experience in flim making doing works for all kinds of film viz., Feature Films, Commercials, Documentaries, and short films including photoshoots.
For the requirement that you have mentioned here, we have two good Islands Andaman & Nicobar Islands, Laksha Dweep. Some of the photographs of the Island with its blue lagoon are attached here.
As far Mountain ranges are concerned you cannot find the best in any other place in the world, than the Himachal Pradesh, Leh etc. Some photographs of Leh is also attached. This is the right season to shoot in all these places.
If you need more details do not hesitate to write to me.
With best regards
Venugopal