I'm sure you have your hotel and a lot of the meals pre planned. Not sure when you will have free time.
For gambling, I'm not your guy, I dabble, but nothing hard core.
Try to take one night and walk the strip.....but not on the street, go through all the different hotels. Go all the way down one side and back the other. Take some time in each to grab a drink and check out all the stuff. There is so much to see. NYNY is really cool (although I wouldn't stay there). There ferrari dealership in the Wynn is cool. There are good restaraunts scattered around. I try to hit Smith & Wollenskys steak house one night......the best steak fellet ever.
If you have another free night go down town to the freemont st experience. Drinks are cheap, people watching is fun, and the light canopy is awesome. Plus you can stop by the Pawn shop from Pawn stars on the way down.
The ghost bar on top of the palms is pretty cool. Might catch a celeb there on the right night.
Plan your clubs in advance. If you don't have VIP entrance, a wad of cash or a group of really hot women with you don't bother, you won't get in. Usually you will get complimentary line skip if there is a club in the hotel you are staying in.
Other than that, bring a lot of money for drinks if you like to drink....not like Milwaukee expensive, more. Redbull Vodka - $12-$18, Captain & Coke - $10-$16, etc.
Have fun. If I think of anything else, I'll let you know.