Treat the coastline as a loose direction, not a rigid itinerary. A day of scenic walks, an old neighborhood, and a seafood meal is enough.
Watch the season, and also the wind
The same stretch of the seaside can vary greatly depending on temperature, crowds, and wind strength. Wear layered clothing and keep your most revealing walks flexible.
Don't just stop at the main coast
Small neighborhoods and local markets add more urban character than a single trail. Take public transport or take a short taxi to widen the radius a bit.