I LOVED Vegas. Not a gambler, thought I would hate it, but DH persuaded me to go for my 30th and it was so much fun. We've been back a few times since and I've loved it every time. I've stayed at the SLS, Mandarin Oriental (now the Waldorf Astoria) and the Cosmopolitan, plus a Green Valley Ranch off the strip, and I really rate the Cosmo and the MO.
The dining is excellent, as is the people watching and the bar scene. I also really enjoyed the Cirque du Soleil shows, the Rose Rabbit Lie supperclub, Absinthe and their sister show Opium.
Oh and the spas. THE SPAS. The one at the MO has a view across the strip and it's so beautiful. I spent hours and hours in there and at their guests only pool. It was so quiet and relaxing. I also had a day at the Sanctuary Spa at the Hard Rock Hotel (RIP) and loved it.
We also went to the Marquee Pool Party (hilarious) and for my 30th, Clubbing at Tao and at 1OAK. I love dressing up, so we also did some posh dinners at Hakkasan, Asia de Cuba and Bazaar Meat's by Jose Andres. Plus the bar at the Mandarin Oriental with beautiful views and even more beautiful cocktails, and the Chandelier bar at the Cosmopolitan.
Eurgh. I can't wait to go back. I live in the US, but 23 month old DS would put a bit of a dampener on it (he'd love it though...).