Make arrival and departure work first
Autotrolej maintains an official route 32/32a page for the Opatija area with dated timetable documents. Use the document valid on your travel date, then confirm your stop and final walk. Do not infer an airport transfer or a late return from the existence of a route.
Check the route you will repeat
Trace the property entrance to the promenade and your chosen bathing place. For a pushchair or limited mobility, ask about stairs, lifts and the return uphill. Keep a taxi or bus alternative for any walk you would not want to repeat with luggage.