So the first essential ingredient is a dream. Of course, imagination by itself does not suffice. You must acquire the skills to match your dreams—or you will remain a bemused armchair sandcastler, nurturing pipe dreams of unfulfillable glory. / Fortunately the skills required for sandcastling are developed with reasonable ease in a pleasant environment.
Source: wiktionary
A major principle of sandcastling is always to complete your work on a higher level before proceeding to a lower level. […] Making up your own techniques is not difficult. In fact, the more sandcastling you do, the more you will find your imagination taking over.
Source: wiktionary
These sand castles and other constructions became centerpieces for annual festivals and competitions. “Sandcastling” moved beyond family games for kiddies to become a verb. […] Sandcastling origins, far upstream in time, may go back to Egyptians who, four thousand years ago, made sand replicas of pyramids and monuments. […] Sandcastling now joins a host of other occupations which, increasingly in the 1990s, enliven varied sites with once limited but now expanding artistic activities.
Source: wiktionary
In summer you can nip over to the Lido for a paddle and a bout of sandcastling.
Source: wiktionary