Disclaimer: I am both new and very critical, which is a bad combination, but I am honestly and genuinely just trying to offer what input I have. So don't take it too hard. 
Totally agree with dipstik on the composition note. I like the composition in the fourth photo the most because your subject (the intersection of the logs in the foreground) is the most obvious in that one. It seems like your subject in the third photo was the geyser, which makes me question why you included as much in the frame to the left as you did. If you did it for color contrast, try cropping some of that stuff out, and see if you like that any better.
I have been taking a pretty good number of pictures since I have been home, and where I have improved the most is by making it obvious what my subject is. I feel like two good ways to do this are 1) by having the subject be either much darker or much lighter than the background and foreground and 2) by having the subject in sharp focus with most other things out of focus. I would advise zooming in some and playing with your depth of field to make your subject "pop" a little more. I have definitely found this is more difficult to do, mentally, shooting large-scale landscapes because so many things around you seem capturable. I used to do this a lot: "Wow, this whole scene looks really nice. I want to take a picture of everything in front of me just as it is. But I don't know what to expose the picture for or what to focus on because I don't know what my subject is..." Picking out a particular aspect of a landscape can be considerably more interesting than having everything in focus.
That said, the colors and sharpness are fantastic. Though the composition may not be "interesting" from a photographer's standpoint, I can still see that the range of colors you were looking at was really cool. (Which is why you shot it, I guess.
) And the perspective in #3 is interesting, IMO.
Keep shooting! It works!
"I said flotation is groovy"
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