My two cents worth.... K-30 or K-50 with the DA 18-135WR lens .... this lens will cover most of your needs.
As noted, you don't want to be changing lenses in a really damp location. Further, I am guessing you will be staying in places with air conditioning. Big temperature changes in damp locations mean condensation. While this camera body and lens are weather resistant, I still recommend you place your camera inside a plastic bag when going from warm to cold and vice versa. Any condensation will accumulate on the bag rather than your camera. Give the camera a few minutes to acclimate to the new conditions before removing from the bag.
jatrax recommended memory cards, I'll add that you should always have a fully charged spare battery with you.
Using just the 18-135 lens, you can fake both a longer lens and a macro lens through a combination of a higher shutter speed and cropping. Obviously cropping will decrease the maximum size print, but not by as much as you might think.
The photo below was taken with the K-30 and 18-135 this spring from behind the centerfield fence (250-300 feet) at a local Little League ball game. I was out walking the dog so the shot was pure serendipity. If this was a planned photo opportunity, I would have had my 55-300mm lens with me. With 'only' 135mm available, I ended up cropping a lot to get the image I wanted.