You also need to get from the airport to the hotel. Unfortunately the monorail doesn't go to the airport. I'm sure the taxi drivers' union had something to say about that...
I bet you could do it for $1000 if you're willing to scrimp, search around for the best flight deals, hotel deals, meal deals and take just a few classes a la carte. But remember that it's a fully (except meals and entertainment, which are only 50%) deductible expense, so it will only "cost" you somewhere between 50 and 75% of what you lay out. So we always plan on quite a bit more. This year we're renting a Corvette convertible to get back and forth. Of course, we may drive around the desert a bit too... And, living in the boondocks, fine dining is something you only see on TV (if you have satellite) around here, so we like to spend at least a couple hundred on dinner a time or two. Then there's Cirque du Soleil and numerous other shows that are ripe for watching. It will be a whole lot more fun if you plan on $2000.