There are three things to remember when visiting a beach that is littered with tar. The first is that you should not wear shoes. This sounds counter intuitive, but it is much easier to get it off your feet than your shoes. Also, it will show that you are clearly a tourist, because no local of any beach town will every wear shoes at the beach unless they're going for a run (maybe). The second thing is that you are better off planning for getting tar on your feet before you leave the house, just in case. The third is that NO amount of soap and water will effectively remove tar.
There are products sold specifically for removing tar and they honestly work no better than simple cooking or baby oil. Plus, they are expensive. It is best to leave oil and paper towels or an old T-shirt in your car or outside your house so that you can remove the tar before tracking it everywhere. Oil will also work on hair and flooring. It may save clothing and carpet, but I wouldn't count on it.
Awesome Tip of the Day: So why not wear shoes? Because shoes are expensive and feet come standard. ;) The skin on your feet is constantly growing and shedding. Even if you did nothing to remove the tar from your feet, it would eventually come off. Your shoes, however, do not change. Once tar is in there, it's in there. The oil trick may work on your shoes but it may still stain an ugly brownish black color and the oil itself can be corrosive to the rubber soles, causing accelerated wear. Walking barefoot is good for you anyway. Just watch where you walk.
If a bottle of oil is not available, you can always use grass and sand. The juicy plants like grass and other plants commonly found near the beach are pretty good in a pinch. From standing, remove tar from one foot at a time by pressing your foot against the grass in a twisting motion. A round tuft of grass fits foot arches quite well. Once the majority of tar is removed, a quick sanding will get rid of the rest. Voila! Clean feet. The photo at the top of this post was taken after a quick rub in the grass. As you can see, there isn't much left.
While you are visiting our beaches, please remember to pick up after your dog and do not leave cigarette butts, bottle caps, or other trash behind. Such pollution can leave our local surfers and other wild life sick or injured. We take our beaches very seriously, but we are usually friendly and will kindly welcome back respectful visitors.