whenever we go to the states we change our money here, normally at the post office, good rates and no commission, and we take a few $50 travellers cheques, dollars in cash then use visa card for everything else, then pay it off all in one go when we get back, a lot of the cash machines out there have a fixed charge it is a few dollars at the time. hope this helps you a little bit, good luck, have a great time
Vegas is a great place at night, but bit of a building site in the day, get a pass for the bus that goes up and down the strip, you can then hop on and off as often as you like, you buy them on the bus and the buses run 24 hours a day.