Only three days in San Diego and not sure where to start? A a coastal city with a Mediterranean climate, San Diego is a go-to destination with plenty of activities found on land, in the sea, and in the air. Try a surf lesson or yoga classes on the beach. Take to the skies over San Diego in a helicopter tour or a hot air balloon ride to watch the sun set over the Pacific Ocean. No matter how you decide to spend your three days in San Diego, we're sure you will have some fun in the sun!