I think when they arrived Punk Hazard was pretty nice beacuse it is luffys luck to get to island not even shows on the log pose
but i didnt get why is he so supriest to see a dragon he have seen one before
i cant rember which episode it was but when they get to the island were it is the little girl and the grampa who tells all the long storys when luffy sneak out and follow the trail of the little girl and into the mounts and when they find the dragon in the mount and then trying to get it home to island but it show it is the island they came from just need to wait to right moment ... so if he seen a dragon why get so shocked