Yes... hard to choose.
I like 6&7, but I think the background detracts from the gold warmth in the rest of the images. So nix to them I say. If they were over open water, they would be picks.
My first instincts brought me to 5&9, but after review I think 5 is probably not special enough for a competition. But I think 9 has a very nice feel to it, somewhat cinematic. (again that dark horizon, but what can you do)
10&11&13, have a nice light feel, which contrasts 9, of them I think 11&13 are the best there. I'd probably lean towards 13 because the sky is more interesting than a canoe. These remind me of a certain Monet painting (well actually he painted that scene a few times with a different color cast each time).
I'm not a fan of the birds, but I think 1 is the best. It has a certain zen/balance to it. When I first saw it I thought, "cut off the top." But then after imagining the crop in my head I see why it is the way it is. Its one of those pictures that you first think the rule of thirds or golden mean will help, but the picture is such that you cannot remove from it without messing up the balance itself.
No since, I'm assuming you don't win the competition based on how well the choices jibe together (9&13 don't go well together at all) I'd say 1 & 9 & 13 would be my choices.