10. Del Mar Beach
Where: San Diego, Calif.
Why It's the Best: California's Del Mar Dog Beach is world famous even though it's only open nine months out of the year. From September to June, your dog can frolic free of its leash at this clean, laid-back beach. Del Mar Dog Beach is close to everything: the fairgrounds, horse racing and a playground. It's the perfect place to bring the family and the family dog.