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Sometimes there just isn't time for a tripod, and then it's up to knowing enough about photography and one's camera to get a sharp shot while handholding. I take it your 16-35 doesn't have VR? Mine does, and boy, it can be a life saver, even if it's only once out of every 50,000 shots.
Good work on these, #1 is my least favorite, I don't like the light and coloring on that one rock in the lower right. #2 is my favorite, that is a very clean composition, and it really shows the rainbow off well. #3 would be my next favorite, well done with a wide view and no distracting elements.