Don't bother using this service!  Like another reviewer, I bought my vegas package with travelocity.  when i got to vegas, went to gray line customer service desk - RUDE! and won't give you the time of day.  Even if we pre paid for service, they refused since we did not have a printed out voucher, even though we had on our iphone and gave them the voucher number.  we ended up paying again using the shuttle next door.  Gray Line really SUCKS!