If you're looking for a tranquil place to spend a little time, head to St. Jamess Church. This holy sanctuary offers a wonderful break from a jampacked travel schedule.
This house of prayer in Opatija comes recommended by many travelers, so make sure it features on your travel itinerary. Don't think that's all there is to do here, though. There are many more options waiting for you to experience after St. James's Church. Lido Beach, Slatina Beach, and Maiden with the Seagull Statue are not far away.