This beautiful quiet beach is at Ardtoe, near Acharacle on Ardnamurchan.  Great for swimming or paddling.  The sand is clean and the water is shallow.  But cold!  There is some parking on a crofter's area - just room for half a dozen cars, but there were never any other cars when we went (June).  After your swim (or paddle) go into Acharacle where there is a fantastic bakery.  They sell the usual pies and pasties, but also some fantastic sweet chocolatey things.  Very fattening and very delightful!
Have a look at villagecanvases.co.uk for more Scottish images.