Although we were in LV last year we only spent one full day in the city so apart from a quick walk down the strip and a peek in the Bellagio and Ceasars, didn't really do much beyond our hotel (Ballys) and the Paris.
However, this year we have 7 days in total (split into 4-1-2 days) over the 18 we're in the US, so I have much more research to do :)
At the moment I'm reading a lot of trip reports and people mention 2 for 1 discounts and coupons that they pick up in Vegas. So where will I find these coupons? Am I right in thinking there are also free listings papers with offers ad well? I have to say all this passed us by last year.