photographic style is always a choice. If you want to have all the possible gear on your back, you will have heavy health problems...
My choice - and strong suggestion - is that the best exercise to gain the best experience in photography, travelling or at home is the same, is to be "at minimum": a D700 with a 50mm f/1.8 is the essential to learn that every image that you take is always "a frame of reality" and it will be never as you see with your eyes. Than you can however come back home after a trip with special ad unique photos, that are the product of your vision, not from this or that camera and lenses... This is only my idea, but it's a strong exercise to improve your photography
My suggested - and preferred - gear: D700, 50mm f/1.8 G (the front lens is deep and it's not necessary to have always the hood mounted), a second battery, two 8 Gb CF cards (I think that 400 photos is a good number for a 15 days trip, RAW only, of course). I use no flash, the D700 produce low noise files even at ISO 6400 and post processing with Capture NX2 or, better choice, with DxO is very god for quality.
Some masters told that "the very best zoom are the legs"
Try and enjoy the soul of photography, don't worry for the gear.