I like #48 & #50. I'd like the dolphin to look less like a shark and look softer. On both I'd like a cool blue color instead of the blue you used and use a sand color instead of the green. On #50 I would like the river to go through the tail like #48 instead of going through the middle of the dolphin.
#80 & #81 can you please change under the nose of the dolphin, it looks jagged like it has teeth of a shark. If you can fill that area in and make it more like the shape of a dolphin without loosing anything else that would be great. Also I'm looking more for a lighter blue like sky blue or a cool blue for the color of the dolphin/writing
btw, this litle explain my concept,,, I have been thinking must emphasize dolpin and not a landscape so it can instantly recognizable from a distance, thus avoiding misinterpretation, because I think this is not a logo about tourist attractions:-)