Not too extreme but thrilling nonetheless. Reach speeds of up to 50km/hr on a large tea tray on wheels with a brake, which you might want to use. A fantastic view of Prague, restaurant, lift back to the top and adrenaline boosting 800m runs make a fantastic day out. 60Kč a run or 280Kč for 6 runs. Take bus Nº 140, 187 & 233 two stops (to Kelerka) from Palmovka.