Yeah... no need to be scared at Whitehaven in the Whitsundays. So long as you visit at the right time. Unfortunately I didn't and had to wear one of those ridiculous stinger suits. Still, it was saving my life, so was sort of important.
My votes? Whitehaven is up there.
I was on Magens Bay in St Thomas USVI on Monday - it was AWESOME.
I have a soft spot too for Playa Grande, Dominican Republic. The pic doesn't really do it justice though...
The beach at Lemuria, Praslin Seychelles was amazing too..
Then there's Antigua, parts of Florida, Bondi, the California coastline, and don't laugh, Tenby in Wales.