One of the best aspects to some of the games on this list is you can tailor them to your preferences. Take for example the game of ladder golf, which did land on this list. If you wanted to go by the official guidelines of ladder golf, the two frames need to be 15 feet away from one another (or whatever distance is claimed in the instructions). Or, some people will merely walk five paces and then use that as their distance.
But, on the beach, you make the rules and you are the official. Because of this, you can place them as close or as far as you wish. If you have smaller children playing with you, you could only have them 5 to 10 feet away from each other. Or, if you think it is too easy the way it is, you could back it up another five feet.