The fountain show is spectacular at night! You don't have to be a guest here to enjoy that. You don't even have to be staying on the Strip. Just walk by and watch.
During the holidays, the fantastic floral animal displays inside are totally, absolutely awesome. Bring a camera or two and marvel at the handiwork. Someone really put all those together...too beautiful and cool. We were very impressed.
If ever in Vegas around the holidays, the Bellagio is a must-see.