While indeed a nice picture to look at, especially after 31 years in the shoe box, there is room for improvement. This is especially true owing to the fact that the image had to have been scanned, and therefore the improvements were at-hand prior to posting the final image.
The horizon was tilted, and contrary to one critique, this should have been corrected. Of course, rotating the image to remove the tilt, cropping is then required. Before committing to the crop, look at the image and notice the huge dark blob of nondescript foliage taking up nearly 1/3 of the scene. Note too that the original horizon is too close to the centerline. My crop cures both, removing the mass of dark vegetation and moving the horizon close to the 1/3 point.
Opening the image in PS and invoking sRGB color space (profile), what appeared at first to have been a blue color caste was actually revealed as a green-blue caste over the entire image; the red channel was starved. I used a Channel Mixer adjustment layer to moderately boost the red channel and slightly reduce the green channel, removing the caste, so that now the sand is at least recognizably white-ish, and the skin tones more natural.
If we are going to the trouble to keep and preserve a really great image for many years, then scan it and post it for public consumption, we may as well learn a few short, easy steps to get it right.