I really love going to Vegas. I went for the first time (since I was a kid) a year ago, in March. And then went back again in September, and again this past March. I love the place and I don't gamble at all.
New York, New York - Gallagers Steak House, the game room, roller coaster, great Mexican restaurant, and most of all, Cirque de Solei Zoomanity (Not for the kids, but a great show for couples)
Hooters Hotel - Hooters wings and the only Hooters that sells hard liquour.
Bellagio - dancing fountains, seasonal garden, three chocolate fountain
Paris - Eieffel tower.
Lots of other great shows I haven't gotten to see yet.
Just walking the strip and people watching is fun. Lots of bars, one area, by Margarittaville, always has an outside band and bar area. It's always funny to watch the "girls" working the drunks at the bar late at night too. No guy sits alone for long at the bar lol.
Outside of Vegas there is a ton to do too. Helicopter ride over Hoover Dam and Lake Meade, walk over Hoover Dam, jet ski Lake Meade, hike Red Rock Canyon, day trip to Death Valley, day trip to Grand Canyon South Rim, take a night to go to San Diego, see the zoo, Tiajuana, ride the coast line, or go to Los Angeles for and check out Hollywood.
Everytime I leave there, I can't wait to get back and do some more of what I've missed.