In case you wish to skip the sauna or dinner, or have otherwise some extra time in Turku, one possibility is to take a short (approx. 800m) walk from the Aurum building with the following potential stops (in order from Aurum):
The Turku Cathedral, Finland's oldest church;
Vanha suurtori next to the cathedral with shops, restaurants and the sight famous for the yearly televised Christmas speech "Joulurauhan julistus";
Aboa vetus & Ars nova, an archaeological and contemporary-art museum in the joint premises.
Alternatively, the city center is approx. 1 km away.