1). Castle complex. The Český Krumlov State Castle and Chateau complex is easily the most visited site in the city, and there’s plenty of good reasons. Apart from the architecture, atmospheric restaurants, drink stands, gardens, theatres, hedgerows, trees, and souvenir shops, the famous Bear Moat contains live bears, which can be observed from a bridge that crosses above it.
2). Running the Vlatava. The river that connects Český Krumlov with Prague speeds up considerably both in and out of town during the summer months, making this particular stretch ideal for tubing, rafting, boating. There are even guided tours and pub-crawls emanating from several of the hostels that stop for shots and beer at strategic spots along the way.
3). Museums and monuments. Visitors interested regional history and culture can take their pick of several museums and monuments. Guided tours at a local graphite mine expose visitors to the history of mining in the area, as well as the conditions under which miners have labored over the years. The Regional Museum houses a ceramic scale model of Český Krumlov as it existed at the turn of the 19th century, as well as fossils, archeological artifacts, and Bohemian antiques. Egon Schiele Centrum Museum is dedicated to solely to work of the titular Schiele (a contemporary of Gustav Klimt), who resided in the city briefly before being driven out by residents who considered his work immoral.