Another free thing to do in Vegas. Another thing to take your breath away in the Bellagio. Apparently the conservatory changes by season, so you should definitely go every season to see what beauty they'll come up with. If I could have a conservatory like this in my house, I definitely would. Just imagine the work that it takes to maintain all these flowers!
If you walk to the gift store, you can find some pretty shot glasses/glassware to take home as souvenirs for family and friends, granted it's a little expensive. I think it was $12/shot glass. But, since you're in Vegas, and you're bleeding away all your money anyways, you may as well.