Depends what you are after: Stodolni street used to be cool party street, though not so much today. There is loads of industrial historic sites. Landek park with the Exposition of Mining Museum is good and you get even into the mine. Vitkovice is also nice. There is some castle and Zoo around as well. Definitively there is plenty to see (not mentioning the mountains near by) Maybe for reference: http://www.ostrava.eu/jahia/Jahia/ http://www.ostrava.eu/jahia/Jahia/site/ostrava/lang/en/ostrava/turista/turisticke-zajimavosti