Laguna Beach without a doubt one of the most scenic spots JMO on the coast. If you like art there are some Incredible gallery's there.
Newport and Balboa Island are right near each other (short ferry ride across).
Seal and Huntington Beach are nice surfer towns with a laid back vibe.
If you want to see the local street performers and general weirdos Venice Beach is the place. I personally didn't think much of it.
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