i don't think you will be shooting few thousand shots per day right? if not, you don't have to bring so many batteries, just bring along your charger so that you can charge every nite before you go out the next day..
get a wide angle for landscape.
for SB600. i suppose u dun need tat much AA batteries unless u shoot wit flash a lot.
i brought my SB900 with only 1 set of AA batteries precharge.. only use on some night shoot potraits..less than 100 i suppose.
didnt recharge the AA batteries during the trip at all.
hmm.maybe add a 50mm
or a tripod if possible...but if too cumbersome or u r going wit tour. can forget bout it.