Take a day trip to the spa town - stroll around, drink the disgusting water, go for a meal and the best bit - walk in the woods above the town.
Get a bus from Prague bus station (Florenc), they go every half or three-quarter hours. The journey takes two hours. When you get there, get some bus tickets from the tabak at the town bus station. Ask for Kolonada, go for a stroll along it - about 1 hour. Have a meal there, then walk it off by taking the funicular Diana by the Pupp Hotel (goes every 15 minutes) and walking in the forest. Unless you know someone there, there isn't much else to do, unless it's the film festival, in which case it's very buzzy, but only then.
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