No question about it. It's San Diego Coronado Beach.

San Diego is popularly known for it's perfect weather condition all year round which adds up to its attraction as one of the best tourist destinations in the world.

San Diego is gifted with not only 1 or 2 beautiful beaches, there's a lot to choose from:

Here's a list of beaches you may consider when you go to San Diego:

San Diego List Of Beaches

And if you want to make reservation for hotels in San Diego read this first:
San Diego Hotel Reservations Guide
Make San Diego Hotel Reservations