Since I've given two negatives ($7.77 special and Fremont Street), I'll share some things that I really enjoy about Las Vegas.
1: The Bellagio Fountains at dusk. That's my favorite time to watch the show. You're not in the harsh sunlight or pitch black of night. Something about the blue hour that makes it just a bit more enjoyable to me.
2: The Eiffel Tower replica at Paris. Nice views, especially if you take my advice about dusk:
Serene by
wbeem, on Flickr
3: The Bellagio Conservatory. I like to go either very early or very late to avoid the crowds. It's very comforting to walk around, except when you're fighting a bunch of tourists who aren't watching where they're going (much like at Disney World!)
Conservatory by
wbeem, on Flickr
4: One Million Dollars. This is in the walkway between Paris & Bally's. It makes me plot & scheme.
One Million Dollars by
wbeem, on Flickr
5: Alternative Gambling Opportunities. You may find some unauthorized games on the street. They're not fond of having their photo taken, though.
No Pictures, Buddy by
wbeem, on Flickr
6: Play "Guess Who's the Prostitute" at any casino bar. It's not always the ones you think.
In the Pleasure Pit by
wbeem, on Flickr
7: Watch the "Walk of Shame." You have to get up early, but it's not hard to tell who was sleeping elsewhere the previous night.
End of the Hooker Shift by
wbeem, on Flickr
8: Get High. I really enjoy elevated views of the Strip. The Eiffel Tower is one, but there's also a bar on the 23rd floor of the Mandarin Oriental with a good view (and expensive drinks). House of Blues Foundation Room is open to the public on Monday evenings (Mandalay Bay). You can also get a nice view from Mix on top of THE Hotel.
Foundation Room View by
wbeem, on Flickr
Whiskey or Wine? by
wbeem, on Flickr
South Strip by
wbeem, on Flickr
9: Grand Lux Cafe. This is a sister-restaurant to the Cheesecake Factory. They have one in The Venetian and Palazzo next door. On every trip, I go get this meal - Jamaican Pork Tenderloin and a Grand Mojito. You may or may not like it, but it suits me fine. At any rate, they have a big menu, large portions, and it's not too pretentious. A bit loud, though.
Jamaican Pork Tenderloin 3 by
wbeem, on Flickr
10: Carnitas & Tequila at Pink Taco! This is another one of my favorites. It's inside the Hard Rock Hotel. I always say I'm going to try something different (and one time I did), but I come back to the Carnitas and a flight of tequila.
There's plenty more that I like in Las Vegas. I've visited about three times per year over the last decade and watched it change. It's getting a bit crowded lately, but this seems like a good time of year to go.