Seen O several times and highly suggest it. I've seen every Cirque and O is my second favorite (to Quidam). Try to sit front row balcony or lower level but up a little higher. Sitting right up front is not the best seats and yet are the most expensive. Between Love and O, I'd see O. Skip Zumanity if it's still there, not worth it. Ceasars as mentioned is cool and Bellagio is fun to walk around. Personally I think that the Wynn is dreadfully ugly inside. It's like a rainbow puked in the lobby, or at least used to look that way. Try to get out of town as well if you can. Take a day trip. Give yourself time in the airport on the way back. Many people on their first trip are late to the gate. Don't ever gamble anywhere outside a casino (airport, laundry, grocery stores, etc.) You are better off tossing your money in the Mirage fountain as the payback is probably higher bouncing off the water. Have a great time.