I really like the one in the top right hand corner. Keep working on that and you may have a real contender there.
This had a decidedly woodsy feel where Panama is actually in a rainforest, surrounded by oceans and divided by mountains. Your design feel is good though, perhaps give it another shot.
I love the color combos you're getting with the blue and orange. I also like the simplistic angle that you're shooting for, but the tree just isn't going to cover it. Perhaps try working in some more elements. They don't have to be a building, a beach, a mountain, a hammock, a bird. You're obviously a good designer, you can get those things, that attitude, the place across without the actual graphic and you're on a great path to getting there.
This is a great shot too. I like the combos of color and the allusion to various elements. It doesn't have the dynamic nature that we're going for yet and it's not quite refined, but keep at it.
These are a little generic and 2 of them are very dark. There can be some black in the logo, but we're going for a happy, tropical, upbeat, friendly, trustworthy feel.
This feel very much like shades of "The Fast and Furious". ;-) I like the intention, but take another run at it.
Version with a building. If you need me to change something more drastic, tell me . This is a version with modified colors to match the Panama flag, hope you enjoy! I was thinking about putting stars in too for the stars in the flag, but that's even if I make it past round one for your picks.