Lots of Whale Watch tours out of Dana Point. Very fun, not expensive, there are Groupons and other deals available… If you are coming from a cold place, you’ll think it is hot and you’ll only need a t-shirt. I never wore a coat when I lived there but I’d see others walking the dogs bundled up like they were going to the north pole. Layers is a good idea. On the water is a little breezy. Dress warmly if you go on the whale watching.