Quote:
1) Lenses:
a) Sigma 17-50 + Pentax 55-300
or
b) Sigma 17-50 + Tamron 70-200 (the tamron doesn't seem like a great idea)
Where are you actually going? Do you know the environment? I've gone hiking with my Tammy 70-200 before, and it has been an absolute blast due to the darker conditions under the trees. On the other hand, if your camping area is more well lit - and you are carrying a lot more gear, then the 55-300 will make sense.
Quote: I don't own any WR lenses and have wondered if I should buy one... Suggestions?
Get a DFA 100mm F2.8 Macro. Serves as a short telephoto, great portrait lens, WR, and macro in one package. Otherwise, a DA 35 F2.8 Ltd Macro. I don't see a point in getting a DA*16-50 or DA*50-135 as you have those ranges covered already, and it wouldn't really "improve" your collection (unless you plan to migrate over to fully WR gear).
Quote: Monopods are meant more for hiking - if you are camping and want to shoot stars/evening landscapes, a tripod is going to be a must. As far as recommendations, I can't really give any. I have a cheap Dolica carbon fiber tripod that is very light and pretty strong, so I like that - but I don't really know how durable it is for traveling.
Quote: 3) Lighting
a) Flashes
or
b) Light reflectors
Unless you're going to have someone help you with reflectors, I'd just stick to a flash.
Quote: 4) Anything else?
Bug spray. Rainproof jacket. Bag of emergency equipment. The works.