It turns out that bread, cooked vegetables, cheese and other human foods are indigestible for fish. They may fill up on these foods, but they can't assimilate the nutrients and may become weakened or sick. At the beach a stop or a half-stop down can prevent overexposure. A sunshade also helps.
Hot film spoils quickly.
Underwater photography offers the fun of recording the world while snorkeling or scuba diving. You can rent 110 or 35mm underwater cameras. Shooting between 3 and 6 feet works best for focus and lighting. Film should be 200 or 400 due to lower light levels underwater. Use a flash when 15 feet or deeper or on an overcast day.