Anything around the pier has great atmosphere. Duke's (at the foot of the pier) is awesome, a little pricey. Good seafood menu.
Spark Woodfire Grill is on the other side of PCH but has great views and outside tables as well.
I think if you are looking to treat a friend to somewhere gorgeous with good steak or seafood, you could do well with either. I don't know if they're considered "trendy" (I think I'm out of that demographic) but we've really enjoyed it. The ocean views are really the star for both places.
PHXscuba
