Yes, It seems like California has it all; perfect weather, beautiful and touristic places and nice people. San Diego has so much to offer, nobody can say no to such a weekend plan in there.
Do you love the city? The famous Downtown and its Fifth Avenue has the best restaurants, bars, malls and stores in general. Close the beach, near Balboa park and the financial zone, the heart of San Diego is one of the most visited places.
If you want to experience more of the "Cali Style", you should visit the beautiful Mission Bay Park area, close to Sea World and Belmont Park.