Do a few laps or just cool down in the water at Pierre de Coubertin Nautical Stadium. There's tons of fun here for all ages.
When you've finished exploring this Clermont-Ferrand aquatic and recreational facility, why not check out Place de Jaude, Puy de Dome, and Clermont-Ferrand Cathedral? They're not very far from Pierre de Coubertin Nautical Stadium and also a hit with many travelers.