Driving is fine, both places have FREE parking. I always drive when I go to Vegas, it's better than cab fare, etc. You may want to consider staying at the Orleans, it's a very nice place. Not quite as nice as MGM, but very nice, and it would be more convenient for you.
The total cost for painting an interior will run about $1.02 per square foot (about $390 for the for a 12x12 room) of wall space being painted.
The national average cost for painting new construction interiors is $3.65 per sq. ft. (heated floor space) that does not include casework like cabinets vanities etc. Repaints do not require the same volume of paint but do have a different set of challenges.