So, I'm heading to the Galapagos in a few months, and I'm planning what to bring. Weight is definitely an issue - I'm given 44 lbs, all-in. That includes carrying system, clothes, everything, for a week. Needness to say, things are a bit tight.
For the rest of the kit, the body will tentatively be a D5200 or D7000 (not yet purchased), just because of weight and the extra pixels on target of DX. For lenses, the 18-55 DX and 55-200 DX pair because of their light weight. A 35 f/1.8 would be nice as well because I'm not going alone, but if it doesn't fit in the weight budget. Also, a P7100 with Fantasea housing for snorkeling.
With everything else, assuming I just have the P7100, D5200, batteries, charger, 18-55 and 55-200, and waterproof housing, that leaves me with five pounds (80 oz/2.3 kg) of weight to spare for other lenses and support systems. I'd like to bring the 35 f/1.8 as well, but that's 7 oz on its own and would bring my available weight down to 73 oz. Clearly, things are more than a bit tight!
My first thought was the 70-300 VR, but I was wondering if anybody knew of anything that has more reach than that: after all, I'm shooting wildlife. Price isn't an issue: less expensive lenses I'll just buy, and more expensive ones I'll rent.