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 average price to paint an interior room is $1,655. Much like exterior painting, this project can be done without a pro, but just know, a professional painter can most likely finish the job at a faster pace than the average DIYer.