Rick and Melanie will be in Las Vegas from 5/11-5/16, and will be staying at "The D Hotel and Casino"
That is up to you. There are always taxi's and uber/lift available. If you are staying on Fremont Street, and do not plan to leave that area I would say you do not need to rent a car. We will have a party bus to transport from Fremont street to the wedding and back!