Evening, Overall, I would think that the 28-105 will probably be your main lens, staying on the K1 for most of the time. For wide-angle scenes than what 28mm can handle, I would shoot stitched panoramas (put the camera into portrait mode, and then overlap by a third). That approach would be something that I would practice a bit on, before traveling. The 28-105 is a very capable lens, punching way above its weight in terms of image quality. It has some very good reviews around here.
200 is really not that much longer than 105. I would think of possibly looking at something going to 300. Others here are better with the longer focal lengths, in terms of suggestions.
Lots of scenery along the coast to shoot. Should be a very enjoyable time.