While San Diego is known for endless sunshine, we must have rainy days too. Rain or shine, San Diego has plenty of indoor options for fun. From aquariums to museums, here are six ideas to keep you busy on a rainy day in San Diego. Birch Aquarium 2300 Expedition Way, La Jolla, CA 92037 Located on a bluff overlooking the Pacific Ocean, Birch Aquarium features more than 60 habitats of...