Personal Experience: It's pretty dog-gone adorable at dog beach. Watching all the pups play in the ocean, get sandy faces, attempt to swim, etc. This is a clean and friendly dog beach and free! Even if you don't have a dog it's still quite amusing here.
This spot is pretty close to the Hotel Del, which is beautiful outside since you will have your dog and they're not permitted inside. They have outdoor bars and cafes to grab a drink and enjoy the scenery. Walk to the Coronado sand dunes while you're in this area and learn about the crazy secret they hold!