Been about 5 or 6 times and its a great place but not for very long. Make sure you set a limit per day and dont go over it. Use the Hotel safes and split your cash / cards so you dont have the key to your own safe!!
Make sure you dont miss out on the free food and drink, sit on a roulette table for a bit, place the odd bet and then ask for a "buffet ticket", they will give you a voucher for the buffet... Even though its about $10 for all you can eat for some great food, its still $10 to stick on the tables!!
Careful when you play poker or black jack on making bets that will ruin the flow of the table. Found the best place to sit on a Black Jack table is about seat 4 and watch the bets the others are making...
Also if your up for it, and dont already know, learn to play craps, its great fun but hard to get your head around to start. Most casinos have lessons during the day so take the chance to learn!
IIRC there are a few places you can hire high power Dodge Vipers just off the strip for not very much.. But as you had the lambo, you may not be interested!
Also check out the pawn shops for a few bargains. I picked up a rolex for not very much last time I was there. Sold it when I got home and it paid for my flights!!
Enjoy