Things to do
In addition to nice seashore views and natural park surrounding Haikko Manor you can visit Porvoo - nice old town with a dense medieval street pattern of predominantly wooden houses from the 17th and 18th centuries.
Visiting Porvoo

Porvoo is a historical place with narrow streets and old wooden houses which is lovely to see especially in summer time;)
More about things to do in Porvoo
There is a bus stop about 5 minutes away from the Hotel Haikko Manor & Spa, and the bus #1 trip from Haikko to Porvoo takes just about 25-30 minutes.
You can check timetable either in Googlemaps or here.
The bus comes every half an hour before 4 pm and after that every hour. You can buy the ticket by cash or card at the bus (3.5 €) or easier to download the journey planner app (Trips and Tickets by Matkahuolto) and pay through the app (2.6 €).