Maybe not hopelessly... try black and white and adding contrast.. It won't look natural but that's the kind of picture that would look cool being unnatural y'know?
To know what is right and what is wrong, you first must decide your audience and then figure out why you want to fix them. If they are just family snaps, they are just right. If you accomplished what you wanted in #1, why ask what is wrong?
They are fine images for a family photo album but I can see no changes that could make them marketable commercially. The last two are fine for any family album, and I agree that the first could have been a more vibrant image with less exposure. I would have been comfortable displaying that on a wall.