What’s Your Favorite Beach Spot?

I want to go to the beach.  Not the Bozeman beach - a REAL beach.  I want to lay in the sand, read a magazine, and drink pink drinks out of a cup with an umbrella in it.  Last year we went to San Francisco and had the most wonderful time.  I have a bunch of places on the must go to list - Jamacia, Mexico, Hawaii, Costa Rica - do you see a trend?  Yep, all have beaches.  Where is your favorite beach spot?  What's the best beach vacation you've ever been on?