1. A
2. A
3. B
4. I have relatives in Vegas. So, I probably wouldn't need a hotel. We've stayed at the MGM Grand for $60 a night before. If you pick the right weekend, hotels in Vegas are cheap. As far as airfare is concerned, The Watt Mama tells me that $200.00 is about the best that she has found lately. With rental cars, food, and not to mention, gambling, my guess is you are looking at $800 to $1,500 depending on the individual (or couple).
Stay away from Valentine's weekend. Everything will be expensive, and there won't be an empty hotel room in all of Vegas.
One for good, Two for bad,
Doc