Nothing beats summer in San Diego. With friendly locals, 70 miles of beautiful coastline, world-class attractions like SeaWorld and the San Diego Zoo and a laid-back vibe all its own, California's playground is perfect for the young and young at heart. Luxury-seekers will find seaside and mountain view resorts whose sole purpose is pampering. Offering fine dining, golf, spa, yoga and all of the luxurious amenities one would expect. Downtown you'll find hip and trendy boutique hotels in and around the Gaslamp Quarter, the heart of San Diego's sizzling nightlife scene. But summer getaways don't have to be splurges. Value-seekers will find a host of options and family-friendly accommodations. Check out this list of 25 free things to do in San Diego that will surely entertain. Happiness is calling from San Diego this summer - answer the call.