Aberystwyth's promenade is the kind you actually walk rather than admire from a car, wide, seafronting and with the ruined castle at one end and the Cliff Railway at the other. In blustery weather it's exhilarating; in summer it has a gentle, unhurried quality.
The sea air here is genuinely bracing in the best sense. Walk the full length, get coffee somewhere along Marine Terrace, and let the rhythm of it settle you down.