A Coruña is a good option if you would like a larger city type experience. Lots of history there and some nice beaches. Fishing, scuba diving, boating and surfing are all possible. More expensive than Finisterre or Muxia. If you are thinking of walking from Santiago to A Coruña I would suggest good maps or, even better, a GPS with the route loaded. You will be going against the yellow arrows and routefinding will be quite difficult. Here's a photo from last year along the seaside promenade with the tower of Hercules out of the photo to the left and the main harbour to the right:
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Here's another one of the main beach:
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