Konstanzia holiday apartment has very good transport links.
The following sights (small selection!) within a radius of 10km can be conveniently reached by car, bus, ferry or even bike.
1. Island of Mainau www.mainau.de
2. Bodensee Therme (thermal baths) www.bodensee-therme.de
3. Hörnle-Freibad (open-air swimming pool)
4. Sealife
Konstanz www.visitsealife.com/Konstanz/
5. Meersburg Castle www.schloss-meersburg.de