Requirements:
Shovel and round bucket (the kind you use for making little sand towers.
Step 1:
Find a good spot on the beach to make your sandcastle. You would want the sand to be a little bit wet so you should go somewhere near the sea (about 10 - 15 meters away). Now, with your spade, make a line revolving full circle around you. You do not have to move around but simply rotate your body along with the spade.
Step 2:
The first part of the castle that you are going to make is the moat. So right on the outside of the circle which you have just made, start shoveling in the sand and continue to follow the line until you are about 20 centimeters away from where you started. That extra bit will become the bridge. I recommend taking each step backwards after every time you take a spade-full of sand instead of working forwards (it's easier this way). With the pile of sand you have on your spade each time you shovel, toss it in the middle of the circle. The moat should be at least 20 centimeters deep all around.
Step 3:
Sometimes chunks of sand will break around the edge of your moat; here's a trick to stop that from happening: about 10 centimeters away from your moat, put the tip of your shovel into the ground. What you are going to do now is you are going to make a slope. The top of the slope starts 10 centimeters away from the original moat while the bottom of the slope ends at the corner (the corner closest from where you stand) of the bottom of the moat. I probably haven't explained this very well. Maybe this diagram of the finished moat will help you better to understand what to do.
Again, with the pile of sand you have on your spade every time you shovel to make the slopes, put it in the center of the circle - you should have a mountain of sand once you finished step 2. As you can see on the diagram there should be slopes on both sides.
Step 4:
Now, in the moat you need to flatten the sand so that it has a smooth surface all the way round. You also might want to smear some extra chunks of sand out of the moat (and once again, toss it in the center of the circle) which will also make a nice and smooth surface on your moat. Step 3 is just to make your moat nice and neat, so if you want go straight onto step 4; go ahead.
Step 5:
Now you will you will use your bucket. On the opposite sides of the bridge make one tower on each side, by putting sand in your bucket (make sure it's wet sand, but not too wet) and then quickly turning it upside down on the surface. Your two towers should out side the inner circle and moat but still near to where the bridge starts.
Step 6:
All you need to do for step six is smoothen up your mountain of sand which you should have laying there in the middle of your circle, by flattening the sand a bit and with both hands smear the necessary sand, starting from the bottom of the mountain all the way to the top - this will also make you mountain taller. Do this all around the castle.
Step 7:
Now use your bucket to make eight towers all around the mountain. That will be all for step 7.
Step 8:
This is the penultimate step to making your best sandcastle. Take your spade and lightly hit the top of the mountain tip until it has a slightly bigger surface diameter than your bucket. Once you've done that, take your bucket and make the final tower on the top of the mountain.
Step 9:
Finally, do what you did for your moat but instead make it a straight line heading out to sea. The channel should best be about a meter long. So when the sea comes in, it will flow through that channel and flow around your moat as well.
Final touches:
Using a side of your index finger or whatever finger you want to use, press into the mountain (not too hard) which is now a magnificent sandcastle and keep doing that until you've reached the top tower. These prints are supposed to indicate as stairs. Do this two or three more times elsewhere on your castle and it will fully complete. Voila!
