My sister and hubby will be visiting from the UK in July, she would like to spend a few days in Vegas. Is there a defintive web site?

We would like to attend a show, but they seem to be quite expensive, are there coupons or discounts available?

If we were to take a short drive for maybe a photo opportunity, what is a good place?

What are the best (moderately priced) eating (buffets?) places.

Any and all suggestions and advice would be welcome. Thank you