Thanks all for the excellent suggestions.

Walking tours are always something I try to do while travelling so may do that one day or rent a bike and go for a spin. A visit to both Kotiharju Sauna and Yrjönkatu Swimming Hall are of interest as well. The day trip to Tallinn will be near the end of my stay so I don't have to haul all my luggage on the ferry. That should fill most of the stay and hope weather co-operates.

I'll keep checking the hotels for specials and make some decisions a little closer to departure.

Thanks again.