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Most of the best areas are wet, and it is a great advantage if you can retrieve the target on the first dig. Not just because it is quicker.
On each dig you loosen the sand, the water soaks in and loosens it even more, and the target sinks even deeper. A drainage spade can be purchased from most DIY stores, builder's merchants, or from agricultural suppliers.
An extension to beach detecting, popular for several years now, involves detecting in surf and shallow water areas.
For this you need a fully water proofed, underwater, pulse
detector.
This type of detector has been used for off shore underwater detecting, searching lakes and around shallow shipwrecks, for many years now. Detectorists need to wear wet or dry suits, as they detect in water up to and just above their shoulders. The main difficulty of this 'shallow water' detecting, is the retrieval of the target after you have located one. Many devices have been made to do this. The one that seems to be in vogue now is a 1.8m length of 25mm piping, with an oblong box welded to the end at a 35 degree angle. The box has a protruding 'digging edge' at the bottom, and holes are drilled all around the box to create a sieve effect.
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gathering, but I prefer, as
most detectorists do, to find a nice Victorian shilling or two-shilling piece. Beach detecting is easy detecting, mostly flat and easy to walk on, and soft sand makes digging easy. 
