It's always interesting exploring houses from another era. Wander around Villa Grecque Kérylos and try to visualize how this historic house once was.
You'll be spoiled for sightseeing choice when staying in Nice. Villa Grecque Kérylos is a great place to start here, but there are numerous other worthwhile spots to experience. Casino Monte Carlo, Cours Saleya, and Marc Chagall National Museum are not far from the historically significant residence and will fill in your day nicely.